Circling TF Logo Le Party Phantom Sales:

Marketplace indate sales: https://marketplace.tf/items/tf2/337;5;u11

Avg. price of keys @ 1.8 USD

Mar. 25th - 79.99 USD (79.99/1.8=44.43) 44 keys

Apr. 10th - 79.99 USD (79.99/1.8=44.43) 44 keys

Apr. 12th - 74.98 USD (74.98/1.8=41.65) 42 keys

Apr. 16th - 73.00 USD (73/1.8=40.5) 40.5 keys

Sale 1: 40 keys pure - https://backpack.tf/profiles/76561198084367252#!/compare/1586908800/1586995200

Item History: https://backpack.tf/item/1324053218

Sale 2: 38 keys pure - https://backpack.tf/profiles/76561198140565712#!/compare/1585267200/1585353600

Item History: https://backpack.tf/item/1473740599

Low, but not a QS; excluding from range

Sale 3: 40 keys pure (resale of Phantom used in Sale 2) - https://backpack.tf/profiles/76561198818222703#!/compare/1586822400/1587254400

Item History: https://backpack.tf/item/1473740599

Sale 4: 33.5ish keys pure - https://backpack.tf/profiles/76561198110834357#!/compare/1585785600/1585872000

Item History: https://backpack.tf/item/225850568

QS; excluding

Sale 5: 35 keys pure - https://backpack.tf/profiles/76561198062712964#!/compare/1585180800/1585267200

Item History: https://backpack.tf/item/202165710

QS; excluding

Taking a range of 40-44 keys