Maybe it's Maybelline

https://backpack.tf/item/1238623619

Sale 1) Sold for a Secret Prehistoric Pullover + Spooky Victory Lap

https://backpack.tf/profiles/76561198157176919#!/compare/1557273600/1557360000

This was used for the Prehistoric.

Sale 2) Sold for a Beams HKC (252.5 Keys) + Beams AA (75 Keys) + DP Beak (38.5 Keys) + Steaming Rack (34 Keys) + Haunted Ghosts Hallmark (30.5 Keys) + ~29 Keys of Items + Duped Smoking Flamenco (22.5 Keys) + Grail Schadenfreude (18.5 Keys) + 18 Keys + CPS Dragonborn (15.5 Keys) + G. Fetti Safe'n'Sound (12 Keys, no mini) + DP Goggles (9.5 Keys)

https://backpack.tf/profiles/76561198030343929#!/compare/1558137600/1558224000

https://backpack.tf/profiles/76561198062075870#!/compare/1557964800/1558224000

252.5 + 75 + 38.5 + 34 + 30.5 + 29 + 22.5 + 18.5 + 18 + 15.5 + 12 + 9.5 = 555.5, which I’ll round to 555 Keys

Beak Mini

https://backpack.tf/suggestion/5d26765cd3817249ff3ef6ce - 38.5 Keys

Hallmark Mini

https://backpack.tf/suggestion/5d26d485d381727efe22d80b - 30.5 Keys

Flamenco Mini

https://backpack.tf/suggestion/5d26ade267807229ab04804a - 22.5 Keys

Schadenfreude Mini

https://marketplace.tf/items/tf2/463;5;u3003 - Sales ranging from $27.99 to $39.99 within the past 2 months

Given key prices at the time, these sales range from 15 to 22 Keys

There were no other traceable sales I could find aside from one to a buy order at 14 Keys

Dragonborn Mini

https://backpack.tf/suggestion/5d26b1f9d381726dbb50b720 - 15.5 Keys

Goggles Mini

https://imgur.com/a/TvuFTDD - Seller at 9.5 Keys

https://backpack.tf/item/2516996802

Sale 3) Sold for a Duped Secret TC + 60 Keys

https://backpack.tf/profiles/76561198062075870#!/compare/1561075200/1561161600

This seems low here given the only sale on the duped one is 410 Keys on marketplace.

I’m going to use this sale to mini the duped TC for another item.