Current seller at 200 keys: https://i.imgur.com/jUVrZov.png

Sale 1: 170 keys

Seller: https://backpack.tf/profiles/76561198060233163#!/compare/1654128000/1715731200

https://backpack.tf/suggestion/6645b098e0bea00f610d0349

Sale 2: 155 keys

Seller: https://backpack.tf/profiles/76561198040965652#!/compare/1706659200/1706745600

Buyer: https://backpack.tf/profiles/76561197998883721#!/compare/1706659200/1706745600

Sale 3: 152 keys

Seller: https://backpack.tf/profiles/76561198088665810#!/compare/1713657600/1713744000

Strange Burly Beast (119) + 33 pure = 152

These two sales on the currently listed one are a cash-out/quicksell and then bulk; every item worth anything from https://backpack.tf/profiles/76561199071386726 (just the hat, medigun, and Foppish Physician) passes to Skratzy and then Iraq Lobster:

Sale 4: uncertain

Seller: 76561199071386726 (inventory private; presumably cashing out?)

Buyer: https://backpack.tf/profiles/76561198090804715#!/compare/1717372800/1718150400

Sale 5: bulk

Seller: https://backpack.tf/profiles/76561198090804715#!/compare/1718150400/1718236800

Buyer: https://backpack.tf/profiles/76561198161130473#!/compare/1718064000/1718150400

Usable sales: 170 in May, 158 in April, 155 in January, $230/$1.58 (average price 2024-01-07: https://i.imgur.com/s9SxQQd.png) = ~145 on mannco on January 7 (https://i.imgur.com/f1ugPZD.png). Taking 155 keys.