I found a list previously on this subject, but a lot of it was fantastical, so I'd love a list that deals with more mundane things! I added the more mundane ones to this list for ideas :)

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1. A coinbag filled with 1d10 gold pieces u/te_monkey
2. A coinbag filled with 1d10 silver pieces
3. A coinbag filled with 1d20 copper pieces
4. A perfume scented letter sealed with wax. u/te_monkey
5. A crumpled up bounty paper
6. A cloth or straw doll for a child u/te_monkey
7. Soiled clothing that was cleaned poorly or not at all u/te_monkey
8. Religious pamphlets u/te_monkey
9. A half-naked, or fully naked, person tied to the bedposts u/_solounwnmas
10. A half-eaten meal u/_solounwnmas
11. Some playing cards (maybe complete, maybe not) u/_solounwnmas
12. A key to a house/building somewhere in the city. Initials are engraved on it. u/CadetLink
13. A used condom u/TatsumoriYuno
14. Food residue such as breadcrumbs in the bedsheets u/TatsumoriYuno
15. A signet ring with some wax still on it.
16. Some blood on the bedsheets u/TatsumoriYuno
17. A dagger or shiv with some fresh blood still on the blade.
18. A dagger or shive with some dried blood on the blade.
19. A shiv underneath the pillow u/TatsumoriYuno
20. A few empty and half empty pints strewn about the room.
21. A stash of illicit drugs u/BrightbornKnight
22. A single shoe, boot, or glove.
23. A unique looking coin of unknown origin (membership coin for a secret guild, favor from a lord, coin from a distant land, decorative treasure object?) u/KarlFFF
24. A disturbing find such as a severed finger/toe/ear, person or animal remains/bones, or box of teeth. u/KarlFFF
25. A stolen item. May be high profile or not. u/KarlFFF
26. A wedding ring u/IReallyDontWantToDie
27. A small bag of spell components / seemingly random items u/IReallyDontWantToDie and rodlo00
28. The previous occupant of the room, dead under the bed. u/IReallyDontWantToDie
29. A tiny monstrous spider or similar.
30. A picture drawn by a child. u/zombiegamer101
31. Pornography u/ButtonholePhotophile
32. A chess piece u/LordHudson30
33. A parchment scroll that looks to have something to do with a business deal.
34. Travelling documents that were left behind. u/Shakespearacles
35. A notice board job posting. u/te_monkey
36. Some half-burnt candles Silenced_Nocturne
37. A broken quill and an empty inkwell Silenced_Nocturne
38. A small pile of children's drawings of an unidentifiable creature eating people Silenced_Nocturne
39. A cracked crystal ball Silenced_Nocturne
40. A small bag of "gems" closer inspection reveals them to be glass Silenced_Nocturne
41. An earring Silenced_Nocturne
42. Mend wand, broken in half Phoenix_667
43. A winning betting slip, like from a racetrack. It has a lipstick mark on it and a punched hole showing it’s been redeemed already. flyingace1234
44. A receipt for a local tavern/restaurant showing an impressive bill. flyingace1234
45. A rat’s nest of string. It’s too tangled to be of use flyingace1234
46. A small pile of nail clippings flyingace1234
47. A shipping schedule for a local port. One of the ships has been circled but set sail about a week before flyingace1234
48. A carved set of initials on the bedpost flyingace1234
49. Ticket to an underground arena fight ofcbrooks
50. A message scrawled or carved on the floor (hidden) pleading for help / rescue ofcbrooks
51. A religious text for a local god in the drawer by the bed. (Because even in fantasy worlds, you can't escape the Gideons.) moonroxroxstar
52. A chalk pentagram (empty, small demon, small otherworldly creature). World_of_Ideas
53. A crudely drawn map of a building (guild hall, manor house, palace, temple, etc). World_of_Ideas
54. A hat. World_of_Ideas
55. An empty flask or vial. Residue would indicate that it contained some kind of potion. World_of_Ideas
56. A page from someone's research notes (alchemical recipe, artifact, artificer device, cooking recipe, magical phenomenon, monster, person, place, ritual, spell, etc). World_of_Ideas
57. A perfectly lifelike statue holding a belt pouch in one hand and a small gemstone in the other. The statue is posed as if holding up the gemstone to look at it. World_of_Ideas
58. A person that has been tied up and possibly drugged (bounty hunter, guard, palace staff, port authority, etc). World_of_Ideas
59. A piece of jewelry (bracelet, ear ring, necklace, ring, etc). World_of_Ideas
60. A set of clothing that was probably used as a disguise (government official, guard uniform, guild uniform, priestly robes). World_of_Ideas
61. Mismatched gloves Lost_In_Play
62. Mismatched socks Lost_In_Play
63. Glass eye Lost_In_Play
64. Tooth under the pillow. Lost_In_Play
65. A floor plan for the city treasury, which was robbed a couple of days ago, and detailed instructions written in the margins, that fit how the heist was done. MyEvilTwin47
66. A peephole into the next room, with several etchings showing city officials having intimate relations with other people in that room. If you stack the etchings and flip through them, the people in the pictures appears to move. Someone is a very quick draw and also a blackmailer. MyEvilTwin47
67. A broken sword. eDaveUK
68. A blunt dagger. eDaveUK
69. A kitten under the bed. eDaveUK
70. The tavern owners hat that went missing a few days ago. eDaveUK
71. An empty spell component pouch, which smells strange. eDaveUK
72. The leftovers from yesterday’s evening meal being eaten by a rat. eDaveUK
73. A soaking wet cloak. eDaveUK
74. A broken tooth. eDaveUK
75. A piece of paper with several scratched out lines of writing on it. It appears to be several attempts at writing a love letter. It smells faintly of flowers. irialanka
76. A pair of blue velvet trousers, sized large and very baggy. irialanka
77. A palm-sized wooden box with traces of beeswax inside and a couple of stray bees. irialanka
78. Two nearly identical clay statuettes of foxes, one depicted with its mouth open and the other closed. irialanka
79. A deck of well worn, grubby cards. Several are marked rather obviously on their backs and a few cards are missing. irialanka
80. A dried gourd, hollowed out, filled with what appears to be vinegar and was probably once wine. irialanka
81. Half of a heart shaped locket HBorel
82. A lizard HBorel
83. A caltrop with the sharp points rounded off HBorel
84. Bed bugs ButtonholePhotophile
85. A slightly used sewing kit ken_NT
86. An empty flask ken_NT
87. A discarded, crumpled wedding invitation. The ceremony is one town over. d100roller
88. A sending stone accidentally (?) left behind. d100roller
89. Some sort of animal feed for a pet. DC 15 check (DMs choice) to figure out what animal it's for. d100roller
90. A band t-shirt for the "Rockin' Roarin' Mino-tour". It is decades old. d100roller
91. A mysterious symbol on the wall. It isn't magical, but it gives off a bad vibe. You get the sense it was left on purpose. d100roller
92. A generic drawing of a landscape the party has been to lokinlogin
93. A little gadget whose inventor gave up tinkering on frynuggets
94. A very stale blueberry muffin frynuggets
95. A backpack that looks as though it'd been impatiently slashed open with a blade. It's inner contents has been looted. frynuggets
96. A d6 that sometimes rolls a 7 WoesteWam