Item 1

https://backpack.tf/item/12241080732

Sale 1

https://backpack.tf/profiles/76561198078435541#!/compare/1668038400/1668124800

https://backpack.tf/profiles/76561199107865875#!/compare/1668038400/1668124800

11 keys matches

Sale 2

https://gladiator.tf/time-machine?item=Mysterious+Mixture+Taunt%3A+Rancho+Relaxo&at=2022-11-20T01%3A52%3A00.000Z

https://backpack.tf/profiles/76561199107865875#!/compare/1668816000/1668902400

https://backpack.tf/profiles/76561198077346034#!/compare/1668902400/1670457600

Nothing matches

Item 2

https://backpack.tf/item/11862977263

Sale 3

https://marketplace.tf/items/tf2/1115;5;u3092

$39.99 / $2.02 = ~20 keys

Item 3

https://backpack.tf/item/9377781257

Sale 4

https://backpack.tf/profiles/76561198057897812#!/compare/1671494400/1671580800

https://backpack.tf/profiles/76561199192607141#!/compare/1671494400/1671580800

Can't find matching keys

Sale 5

https://gladiator.tf/time-machine?item=Mysterious+Mixture+Taunt%3A+Rancho+Relaxo&at=2023-02-02T01%3A04%3A00.000Z

https://backpack.tf/profiles/76561199192607141#!/compare/1675209600/1675296000

https://backpack.tf/profiles/76561198097972401#!/compare/1675209600/1675296000

13 keys matches

Item 4

https://backpack.tf/item/5055394352

Sale 6

https://backpack.tf/profiles/76561198258257749#!/compare/1669075200/1669161600

https://backpack.tf/profiles/76561199192607141#!/compare/1669075200/1669161600

Nothing matches

Sale 7

Ignoring bot trades

Sale 8

https://marketplace.tf/items/tf2/1115;5;u3092

https://manic.tf/keyprice/?site=marketplace.tf&at=2022-12-03&price=36.99

~18 keys

Total Sales

11, 13, 18, 20

https://mannco.store/item/440-mysterious-mixture-unusual-taunt-rancho-relaxo

Currently listed @~16 keys

Taking 11 - 13 keys c:

Side Note

https://gladiator.tf/sales?item=Mysterious%20Mixture%20Taunt:%20Rancho%20Relaxo&at=2023-02-07T20:08:15.147Z

There are some other sale histories I can't trace here, but they fall into the range anyways