Sale 1: Bulk.

https://backpack.tf/profiles/76561198139507085#!/compare/1555977600/1556064000

https://backpack.tf/profiles/76561198154211785#!/compare/1555891200/1556064000

Sale 2: Untrace.

https://backpack.tf/profiles/76561198154211785#!/compare/1556582400/1556668800

https://backpack.tf/profiles/76561198015534589#!/compare/1556496000/1556668800

Sale 3: Use There.

Sold With Bubbling Bombing Run + 10 Keys Pure For Sunbeams Belgian Detective.

https://backpack.tf/profiles/76561198445526608#!/compare/1558310400/1558396800

https://backpack.tf/item/5917191786

Sale 4: ~50 Keys.

Sold With 6 Keys Pure For Purple Energy Fancy Fedora (55.5). (55.5-6 = 49.5 keys)

https://backpack.tf/profiles/76561198445526608#!/compare/1558483200/1558569600

https://backpack.tf/profiles/76561198850003204#!/compare/1558483200/1558569600

Sale 5: ~55 Keys Pure.

https://backpack.tf/profiles/76561198850003204#!/compare/1558828800/1558915200

https://backpack.tf/profiles/76561198204552535#!/compare/1558569600/1558915200

Sale 6: Untrace/QS.

https://backpack.tf/profiles/76561198204552535#!/compare/1559520000/1559606400

https://backpack.tf/profiles/76561198080179568#!/compare/1559520000/1559606400

https://marketplace.tf/items/252;5;u61

Sale 7: ~52 Keys.

Apr 5

$94.00 / $1.8 = 52.22 keys

Sales: 50/52/55

Going with 50-55 keys.

Thanks to scourge for the premium