You reap what you sow.

https://backpack.tf/item/1235359593

Sale 1) Sold for a Blizzardy Storm Soldier's Stash (56 Keys) + 1 Key + ~1 Key of Items

https://backpack.tf/profiles/76561198053717045#!/compare/1546646400/1546732800

56 + 1 + 1 = 58 Keys

Sale 2) Sold for an It's a Secret to Everybody Tough Guy's Toque

https://backpack.tf/profiles/76561198310972287#!/compare/1547337600/1547424000

Using there.

Sale 3) Sold for a Stormy Storm Rotation Sensation (32.5 Keys) + Disco Beat Down Harmburg (23.5 Keys)

https://backpack.tf/profiles/76561198846287608#!/compare/1547596800/1547769600

32.5 + 23.5 = 56 Keys

Rotation Mini

https://backpack.tf/suggestion/5ca4d9ac67807271974ca801 - 32.5 Keys

Sale 4) ?

https://backpack.tf/profiles/76561198846287608#!/compare/1548547200/1548633600

https://imgur.com/a/MsMpAZw - Seller at 55 Keys