History 1: https://backpack.tf/item/9985053207

Sold for 25 keys, same matches in buyer's compare:

https://backpack.tf/profiles/76561198294870206#!/compare/1619740800/1619827200

https://backpack.tf/profiles/76561198839259306#!/compare/1619568000/1619827200

Silver Cyclone Taunt: Deep Fried Desire (~3.1 keys) + Fist Bump (~2.2 keys) + Starnge Dark Age Defender (~1.8-1.85 keys) + Balloonibouncer (1.2 keys) + Searing Plasma Powdered Practitioner + 12 keys:

https://backpack.tf/profiles/76561198839259306#!/compare/1619913600/1620000000

https://backpack.tf/profiles/76561199153904683#!/compare/1619740800/1620000000

Dark Age Defender mini (1.8-1.85 keys) https://gladiator.tf/sales?item=Strange%20Dark%20Age%20Defender&at=2021-05-17T20:28:59.714Z

Balloonibouncer Mini (~1.2 keys) https://gladiator.tf/sales?item=Taunt:%20The%20Balloonibouncer&at=2021-05-17T20:30:05.539Z

Seller re-sold the Searing Plasma Powdered Practitioner for 16 pure: https://backpack.tf/profiles/76561198839259306#!/compare/1619913600/1620000000

3.1+2.2+1.83+1.2+16+12=36.33 ~36 keys

Buyout was 38 https://gladiator.tf/listings/608f4dc80fe5f46ef3c62aac

22 keys match in buyer's compare:

https://backpack.tf/profiles/76561199153904683#!/compare/1620345600/1620518400

https://backpack.tf/profiles/76561198040912048#!/compare/1620345600/1620518400

History 2: https://backpack.tf/item/6929590470

Sold on Mannco.Store: https://mannco.store/item/9920

May 7: $54.76/1.8=30.42 ~30 keys

Sales at 22, 25, 30, 36

36 got dumped for 22 keys within around a week so excluding.

Let's go with 25-30 keys for now