Taking last 2 months

https://marketplace.tf/items/tf2/31209;5;u198

$99.99 / $1.83 = 54.64 keys

https://mannco.store/item/440-viridescent-peeper-unusual-spooky-head-bouncers

https://backpack.tf/item/10959190041

$60 / $1.61 = 37.27 keys

$80 / $1.63 = 49.08 keys

https://backpack.tf/item/10901675498

No

https://gladiator.tf/sales?item=Viridescent%20Peeper%20Spooky%20Head-Bouncers&at=2022-01-03T23:20:58.655Z

One buy at 24 keys 21 ref

https://backpack.tf/profiles/76561198213778947#!/compare/1636070400/1636156800

https://backpack.tf/profiles/76561198349848918#!/compare/1635984000/1636070400

Untraceable

https://backpack.tf/profiles/76561198349848918#!/compare/1636156800/1636243200

https://backpack.tf/profiles/76561198083226897#!/compare/1635984000/1636243200

35 keys

https://backpack.tf/profiles/76561198083226897#!/compare/1636502400/1637107200

https://backpack.tf/profiles/76561198080687598#!/compare/1637020800/1637107200

40 keys

https://backpack.tf/profiles/76561197970896022#!/compare/1636329600/1636416000

https://backpack.tf/profiles/76561198125791160#!/compare/1636243200/1636329600

Bulk

https://backpack.tf/profiles/76561198261703372#!/compare/1636243200/1636329600

https://backpack.tf/profiles/76561197991710013#!/compare/1636156800/1636243200

38 keys

https://backpack.tf/profiles/76561198238170280#!/compare/1639440000/1639785600

https://backpack.tf/profiles/76561197964171516#!/compare/1640304000/1640390400

Bulk from a now private backpack

https://backpack.tf/profiles/76561199017434769#!/compare/1636243200/1636848000

https://backpack.tf/profiles/76561198188093413#!/compare/1636761600/1636848000

Untraceable

https://backpack.tf/profiles/76561198848406878#!/compare/1639958400/1640217600

https://backpack.tf/profiles/76561199127652476#!/compare/1639872000/1639958400

Untraceable

https://backpack.tf/profiles/76561198188093413#!/compare/1636156800/1636243200

https://backpack.tf/profiles/76561198025349704#!/compare/1636156800/1636243200

43 keys

https://backpack.tf/profiles/76561198025349704#!/compare/1638662400/1638489600

https://backpack.tf/profiles/76561198802447585#!/compare/1637884800/1638835200

Untraceable

https://backpack.tf/profiles/76561198802447585#!/compare/1639526400/1640995200

https://backpack.tf/profiles/76561199084784906#!/compare/1639440000/1639526400

Untraceable

https://backpack.tf/profiles/76561199084784906#!/compare/1639872000/1639958400

https://backpack.tf/profiles/76561198274457577#!/compare/1639180800/1639958400

Untraceable

https://backpack.tf/profiles/76561198056366107#!/compare/1637884800/1638144000

https://backpack.tf/profiles/76561198275853629#!/compare/1637884800/1637971200

Bulk

https://backpack.tf/profiles/76561198275853629#!/compare/1639526400/1639612800

https://backpack.tf/profiles/76561198049761080#!/compare/1639180800/1639612800

Bulk

https://backpack.tf/profiles/76561198049761080#!/compare/1640563200/1640822400

https://backpack.tf/profiles/76561198816854661#!/compare/1640476800/1640563200

Untraceable

https://backpack.tf/profiles/76561198816854661#!/compare/1640736000/1640822400

https://backpack.tf/profiles/76561198107517454#!/compare/1640649600/1640822400

34 keys

https://backpack.tf/profiles/76561198071478507#!/compare/1640476800/1640649600

https://backpack.tf/profiles/76561198089520959#!/compare/1638316800/1641081600

Untraceable

https://gyazo.com/d103b1d35d6532ed2a8c97f0e337fa5b

Buyers from 22 to 31

Sellers from 37 to 55, 37 young, 38 about 2 weeks, 43 25 days

Sales:

24

34

35

37

38

40

43

49

55

Going with 34-40 keys, 43 isn't seeing much at all

34-38 also possible