Redoing with new information, thanks to life is just an rpg for the info!

https://backpack.tf/item/7275674126

Sale 1 - 12 keys pure - Buy Order

https://backpack.tf/profiles/76561198296247440#!/compare/1574467200/1574812800

https://backpack.tf/profiles/76561198274729080#!/compare/1573776000/1574553600

Sale 2 -

https://backpack.tf/profiles/76561198066195760#!/compare/1571788800/1573430400

https://backpack.tf/profiles/76561198296247440#!/compare/1573344000/1573689600

Sold w/ a Green Confetti Modest Pile of Hat for a Strange Ethereal Essence El Mostacho

GC Modest Mini - 14 keys

https://backpack.tf/profiles/76561198006544512#!/compare/1575676800/1575763200

https://backpack.tf/profiles/76561198307517249#!/compare/1575763200/1575849600

I couldn't find a mini for the Mostacho on BP, so I contacted the buyer, who told me he paid 15 keys. Which would put the Sinner's in this trade at... one key. Even taking buyers on the Modest would put it at 3. I think it's safe to call this sale low. https://imgur.com/a/7AGvTUD

Sale #3 -

https://backpack.tf/profiles/76561198274729080#!/compare/1578441600/1579132800

https://backpack.tf/profiles/76561198108020471#!/compare/1579046400/1579132800

20 keys. Screenshot provided since the compares are kinda wonky. https://imgur.com/a/aECY4Mi

Sales at 12 (Buy Order), 1, and 20. Taking 20!