Sale 1: ~63 Keys.

Sold For Head of Steam Blast Defense (51) + Strange Professional Killstreak Australium Force-A-Nature (11.63) + Skin (No mini)

= 62.63 keys.

https://backpack.tf/profiles/76561198013245606#!/compare/1551916800/1552003200

https://backpack.tf/profiles/76561198153789411#!/compare/1551916800/1552003200

Mini For The Head of Steam Blast Defense:

https://backpack.tf/stats/Unusual/Blast%20Defense/Tradable/Craftable/113

Sale 2: ~78 Keys.

Sold For The Eldritch Opening Sky High Fly Guy (42) + Max's Severed Head (21.45) + 15 keys pure = 78.45 keys.

https://backpack.tf/profiles/76561198153789411#!/compare/1552953600/1553212800

https://backpack.tf/profiles/76561198048046849#!/compare/1552953600/1553212800

Sale 3: ~25 Keys. (Calling Low)

Sold For Hot Professional Killstreak Airwolf Wrench (Field-Tested) (25)

https://backpack.tf/profiles/76561198048046849#!/compare/1554595200/1554681600

https://backpack.tf/profiles/76561198085116555#!/compare/1554336000/1554595200

Usable Sales: 63/78

Going with 63-78 keys.

Thanks to scourge for the premium!