Sale 1 - 15 Keys + 14 Ref

https://backpack.tf/profiles/76561198043909598#!/compare/1523836800/1524009600

Sale 2 - 13 Keys + 15 ref

https://imgur.com/a/vAWPEXJ

Sale 3 - 14 Keys

https://imgur.com/a/b3Ybdcn

Sale 4 - 3 marketplace.tf sales at 21.5 Keys, 18 Keys, 23.5 Keys

https://marketplace.tf/items/30976;5;u60/Dead%20President%20Tundra%20Top

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Credits to Randy for the following:

the 13 key + 15 ref sale is too old at this point, 15.5, 14, and 18 are still in date so those are fine.

MP Sale

https://marketplace.tf/items/30976;5;u60

32$ = ~16 Keys

Seller here for 15 as well - https://i.imgur.com/h5JU9CR.png