Item 1

https://backpack.tf/item/12588548357

Sale 1

https://backpack.tf/profiles/76561198163334631#!/compare/1675382400/1675468800

https://backpack.tf/profiles/76561199085116273#!/compare/1675555200/1675641600

Looks like it was bulk for a Snowfallen Bumble Beenie, which never loaded into the buyers inv, and was dumped to quicksell.store

Sale 2

https://gladiator.tf/time-machine?item=Dead%20Presidents%20Dark%20Falkirk%20Helm&at=2023-02-10T03:50:13.000Z

https://backpack.tf/profiles/76561199085116273#!/compare/1675900800/1675987200

https://backpack.tf/profiles/76561198379895923#!/compare/1657843200/1676851200

No clue

Sale 3

https://backpack.tf/profiles/76561198379895923#!/compare/1657843200/1676851200

https://backpack.tf/profiles/76561198850274253#!/compare/1677024000/1677110400

No clue

Everything else in this history is just quicksell.store transfers

Item 2

https://backpack.tf/item/12191743428

Sale 4

https://backpack.tf/profiles/76561198983856237#!/compare/1676592000/1676678400

https://backpack.tf/profiles/76561199446578917#!/compare/1675728000/1676592000

Gambling?

Sale 5

https://backpack.tf/profiles/76561199446578917#!/compare/1676592000/1676678400

https://backpack.tf/profiles/76561198145331385#!/compare/1676678400/1677024000

Gambling?

Sale 6

https://backpack.tf/profiles/76561198145331385#!/compare/1677283200/1677456000

https://backpack.tf/profiles/76561198147059742#!/compare/1677369600/1677456000

Gambling

Sale 7

https://backpack.tf/profiles/76561198147059742#!/compare/1677542400/1677628800

https://backpack.tf/profiles/76561199072654974#!/compare/1680566400/1680652800

No clue

Sale 8

https://backpack.tf/profiles/76561199072654974#!/compare/1680652800/1680739200

https://backpack.tf/profiles/76561198091502579#!/compare/1680652800/1680739200

Can't match anything

Item 3

https://backpack.tf/item/11687269983

Ignoring gambling...

Sale 9

https://backpack.tf/profiles/76561198128293080#!/compare/1677196800/1679356800

https://backpack.tf/profiles/76561199110809353#!/compare/1677110400/1677196800

No clue

Sale 10

https://gladiator.tf/time-machine?item=Dead%20Presidents%20Dark%20Falkirk%20Helm&at=2023-02-26T12:46:07.000Z

https://backpack.tf/profiles/76561199110809353#!/compare/1677283200/1677369600

https://backpack.tf/profiles/76561198874467825#!/compare/1677024000/1677715200

No clue

Ignoring gambling....

Sale 11

https://backpack.tf/profiles/76561199224789549#!/compare/1679356800/1679875200

https://backpack.tf/profiles/76561198337734785#!/compare/1679616000/1679875200

No clue

Item 4

https://backpack.tf/item/9128860752

Sale 12

https://backpack.tf/profiles/76561199422451016#!/compare/1681516800/1681776000

https://backpack.tf/profiles/76561198037674114#!/compare/1681257600/1681862400

No clue

Item 5

https://backpack.tf/item/4983167988

Sale 13

https://backpack.tf/profiles/76561199021559485#!/compare/1652572800/1678320000

https://backpack.tf/profiles/76561198135388328#!/compare/1680393600/1680480000

Can't trace it

Sale 14

https://backpack.tf/profiles/76561198135388328#!/compare/1680393600/1680480000

https://backpack.tf/profiles/76561198850274253#!/compare/1680393600/1680480000

Untrace on seller side

Mp.tf

https://marketplace.tf/items/tf2/30357;5;u60

$29.95 / $2.03 = ~15 keys

Only sale I could find is 15 keys c: