Drew the short straw on this one eh

Item 1:

https://backpack.tf/item/10713178765

Sale 1: Untrace

https://backpack.tf/profiles/76561198062884679#!/compare/1632787200/1632873600

https://backpack.tf/profiles/76561198220098345#!/compare/1632787200/1632873600

Item 2:

https://backpack.tf/item/10658299005

Sale 2: Untrace

https://backpack.tf/profiles/76561198059806422#!/compare/1632182400/1633046400

https://backpack.tf/profiles/76561199125443371#!/compare/1632182400/1632268800

Item 3:

https://backpack.tf/item/10564686078

Sale 3: Untrace

https://backpack.tf/profiles/76561198956272094#!/compare/1630195200/1630281600

https://backpack.tf/profiles/76561198349848918#!/compare/1630195200/1630281600

Sale 4: 44 keys match

https://backpack.tf/profiles/76561198349848918#!/compare/1630281600/1630368000

https://backpack.tf/profiles/76561198155066949#!/compare/1630195200/1630281600

Sale 5: 45 pure

https://backpack.tf/profiles/76561198155066949#!/compare/1630886400/1630972800

https://backpack.tf/profiles/76561199127652476#!/compare/1630886400/1630972800

Sale 6: 46 pure

https://backpack.tf/profiles/76561199127652476#!/compare/1632009600/1632182400

https://backpack.tf/profiles/76561198176218038#!/compare/1632096000/1632182400

Item 4:

https://backpack.tf/item/10553228416

Sale 7: Untrace

https://backpack.tf/profiles/76561199067395206#!/compare/1629849600/1630108800

https://backpack.tf/profiles/76561199102199351#!/compare/1632700800/1632787200

Item 5:

https://backpack.tf/item/10550974230

Sale 8: Untrace

https://backpack.tf/profiles/76561198259851349#!/compare/1629849600/1630368000

https://backpack.tf/profiles/76561198850178158#!/compare/1629849600/1629936000

Sale 9: Untrace

https://backpack.tf/profiles/76561198850178158#!/compare/1629849600/1629936000

https://backpack.tf/profiles/76561199111658162#!/compare/1629763200/1629849600

Sale 10: Untrace

https://backpack.tf/profiles/76561199111658162#!/compare/1630368000/1630454400

https://backpack.tf/profiles/76561198425761681#!/compare/1630368000/1630454400

Sale 11: Sold + 7 keys for Aussie Medi Gun (~60) 60 - 7 = 53 keys

https://backpack.tf/profiles/76561198425761681#!/compare/1630972800/1631059200

https://backpack.tf/profiles/76561198092449612#!/compare/1630972800/1631059200

Sale 12: 33 pure

https://backpack.tf/profiles/76561198092449612#!/compare/1631577600/1631836800

https://backpack.tf/profiles/76561199107865875#!/compare/1631750400/1631836800

Sale 13: 47 keys match

https://backpack.tf/profiles/76561199107865875#!/compare/1632009600/1632096000

https://backpack.tf/profiles/76561198442469360#!/compare/1632009600/1632096000

Item 6:

https://backpack.tf/item/10526006914

Sale 14: 18 pure

https://backpack.tf/profiles/76561198234030904#!/compare/1629417600/1629504000

https://backpack.tf/profiles/76561198070213843#!/compare/1629417600/1629504000

Sale 15: 53 pure

https://backpack.tf/profiles/76561198070213843#!/compare/1629763200/1629849600

https://backpack.tf/profiles/76561198003935476#!/compare/1629331200/1629849600

Item 7:

https://backpack.tf/item/10497878447

Sale 16: Untrace

https://backpack.tf/profiles/76561198381459466#!/compare/1631404800/1631577600

https://backpack.tf/profiles/76561199084784906#!/compare/1631318400/1631404800

Sale 17: Untrace

https://backpack.tf/profiles/76561199084784906#!/compare/1631577600/1631664000

https://backpack.tf/profiles/76561198155513909#!/compare/1631491200/1631664000

Item 8:

https://backpack.tf/item/10485504368

Sale 18: Untrace

https://backpack.tf/profiles/76561198295525116#!/compare/1628294400/1628380800

https://backpack.tf/profiles/76561198007876507#!/compare/1628294400/1628380800

Sale 19: 43 keys match

https://backpack.tf/profiles/76561198007876507#!/compare/1628294400/1628380800

https://backpack.tf/profiles/76561198147078303#!/compare/1628294400/1628380800

Sale 20: Beautiful (50 pure)

https://backpack.tf/profiles/76561198147078303#!/compare/1629676800/1629849600

https://backpack.tf/profiles/76561198087558444#!/compare/1629763200/1629849600

Item 9:

https://backpack.tf/item/10455810872

Sale 21: Untrace

https://backpack.tf/profiles/76561199083367032#!/compare/1628380800/1628467200

https://backpack.tf/profiles/76561198189667951#!/compare/1628380800/1628467200

Sale 22: Untrace

https://backpack.tf/profiles/76561198189667951#!/compare/1628467200/1628553600

https://backpack.tf/profiles/76561198383185026#!/compare/1628467200/1628553600

Sale 23:

https://marketplace.tf/items/tf2/31198;5;u188

Sold for $90 / 1.84 = 48.9 rounding to (49)

Sale 24:

https://marketplace.tf/items/tf2/31198;5;u188

Sold for $100 / 1.83 = 54.6 rounding to (55)

Item 10:

https://backpack.tf/item/10452381311

Sale 25: 63 pure

https://backpack.tf/profiles/76561198220098345#!/compare/1627516800/1627689600

https://backpack.tf/profiles/76561198035109737#!/compare/1627516800/1627689600

Sale 26: 54 pure

https://backpack.tf/profiles/76561198220098345#!/compare/1629763200/1629849600

https://backpack.tf/profiles/76561198354924601#!/compare/1629763200/1629849600

Item 11:

https://backpack.tf/item/10433853859

Sale 27: Untrace

https://backpack.tf/profiles/76561198067226706#!/compare/1632614400/1633046400

https://backpack.tf/profiles/76561198850121720#!/compare/1632787200/1632873600

Item 12:

https://backpack.tf/item/10419363480

Sale 28: 65 pure

https://backpack.tf/profiles/76561198220098345#!/compare/1627257600/1627344000

https://backpack.tf/profiles/76561198059323294#!/compare/1627344000/1627430400

Sale 29: Untrace

https://backpack.tf/profiles/76561198220098345#!/compare/1627344000/1627430400

https://backpack.tf/profiles/76561197963500354#!/compare/1629417600/1629504000

Sale 30: 47 pure

https://backpack.tf/profiles/76561197963500354#!/compare/1629590400/1629676800

https://backpack.tf/profiles/76561199107865875#!/compare/1629590400/1629676800

Sale 31: Untrace

https://backpack.tf/profiles/76561199107865875#!/compare/1630800000/1630886400

https://backpack.tf/profiles/76561198313393318#!/compare/1630800000/1630886400

Sale 32: Untrace

https://backpack.tf/profiles/76561198313393318#!/compare/1631318400/1631404800

https://backpack.tf/profiles/76561199185070445#!/compare/1631145600/1631318400

Sale 33: Sold for a Strange Killstreak Australium Axtinguisher (~10) + Strange Specialized Killstreak Shotgun (~1.85) + 6 keys + ~4 keys in sweets = ~22ish

https://backpack.tf/profiles/76561199185706562#!/compare/1631923200/1632009600

https://backpack.tf/profiles/76561198095197522#!/compare/1631923200/1632182400

Item 13:

https://backpack.tf/item/10408033290

Sale 34: Untrace

https://backpack.tf/profiles/76561199101442624#!/compare/1629504000/1629590400

https://backpack.tf/profiles/76561199127652476#!/compare/1629676800/1629763200

Sale 35: Untrace

https://backpack.tf/profiles/76561199127652476#!/compare/1630540800/1630627200

https://backpack.tf/profiles/76561198208305507#!/compare/1630627200/1630713600

Item 14:

https://backpack.tf/item/10374534981

Sale 36: Keys don't match / Untrace

https://backpack.tf/profiles/76561197969509283#!/compare/1625961600/1626220800

https://backpack.tf/profiles/76561198104508865#!/compare/1626134400/1626220800

Sale 37: Bulk for Distant Dream Translator

https://backpack.tf/profiles/76561198104508865#!/compare/1626652800/1626739200

https://backpack.tf/profiles/76561198063640894#!/compare/1626652800/1626739200

Item 14:

https://backpack.tf/item/10359594555

Sale 38: Untrace

https://backpack.tf/profiles/76561198116002030#!/compare/1626220800/1626307200

https://backpack.tf/profiles/76561198057897812#!/compare/1626220800/1626307200

Sale 39: Sold on SCM perhaps

https://backpack.tf/profiles/76561198057897812#!/compare/1626220800/1626307200

https://backpack.tf/profiles/76561197999063424#!/compare/1626307200/1626393600

Sale 40: Untrace

https://backpack.tf/profiles/76561197999063424#!/compare/1627430400/1627516800

https://backpack.tf/profiles/76561199106217370#!/compare/1627344000/1627430400

Item 15:

https://backpack.tf/item/10347219556

Sale 41: 74 pure (wtf)

https://backpack.tf/profiles/76561198163650366#!/compare/1626480000/1626652800

https://backpack.tf/profiles/76561198956272094#!/compare/1626566400/1626652800

Sale 42: 26 keys match

https://backpack.tf/profiles/76561198956272094#!/compare/1630281600/1630368000

https://backpack.tf/profiles/76561198864631226#!/compare/1630195200/1630368000

Item 16:

https://backpack.tf/item/10338176045

Sale 43: 78 pure (wtf)

https://backpack.tf/profiles/76561198220098345#!/compare/1626480000/1626566400

https://backpack.tf/profiles/76561198299107197#!/compare/1626393600/1626566400

Item 17:

https://backpack.tf/item/10333577031

Sale 44: Bulk

https://backpack.tf/profiles/76561198847680167#!/compare/1630713600/1630886400

https://backpack.tf/profiles/76561198127732922#!/compare/1630800000/1630886400

Sale 45: Sold for a Isotope Specialized Killstreak Bomber Soul Knife (Well-Worn) (~38)

https://backpack.tf/profiles/76561198847680167#!/compare/1631404800/1631491200

https://backpack.tf/profiles/76561198255598283#!/compare/1630972800/1631577600

Sales @ 18, 22, 26, 33, 38, 43, 44, 45, 46, 47, 47, 49, 50, 53, 53, 54, 55, 63, 65, 74, 78

Buyers @ 28

Unsold Sellers:

1 young @ 39,

4 @ 45

1 @ 49

1 @ 55

2 @ 90

1 @ 92

With the bottleneck of unsolds at 45, the one young @ 39, and with buyers of 25-28, I have decided to go with 38-45. This took me a while, since this is one of my first few unusual suggestions, so If I missed anything or if this needs a different range let me know, thanks.