Sale 1: Low.

Sold For Strange Professional Killstreak Australium Rocket Launcher (48).

https://backpack.tf/profiles/76561198135227655#!/compare/1556841600/1557014400

https://backpack.tf/profiles/76561198132741569#!/compare/1556928000/1557014400

Sale 2: Bulk.

https://backpack.tf/profiles/76561198143923986#!/compare/1556841600/1559520000

https://backpack.tf/profiles/76561198129552058#!/compare/1559433600/1559520000

Sale 3: Bulk.

https://backpack.tf/profiles/76561198129552058#!/compare/1559520000/1559606400

https://backpack.tf/profiles/76561198004517334#!/compare/1559520000/1559606400

Sale 4: Bulk.

https://backpack.tf/profiles/76561197994783413#!/compare/1555200000/1555372800

https://backpack.tf/profiles/76561198160856661#!/compare/1555200000/1555372800

Sale 5: ~67 Keys.

https://backpack.tf/profiles/76561198160856661#!/compare/1556236800/1556323200

https://backpack.tf/profiles/76561198218497692#!/compare/1556236800/1556323200

Sale 6: ??

https://backpack.tf/profiles/76561198041108750#!/compare/1556323200/1556409600

https://backpack.tf/profiles/76561198218497692#!/compare/1556323200/1556409600

https://backpack.tf/profiles/76561198354979270#!/compare/1556323200/1556409600

Sale 7: Use There.

Sold With 5 Keys For Frostbite Razor Cut.

https://backpack.tf/profiles/76561198354979270#!/compare/1556323200/1556409600

https://backpack.tf/profiles/76561198859721638#!/compare/1556323200/1556409600

Sale 8: ~56 Keys. (Bellow Buyers)

https://backpack.tf/profiles/76561198859721638#!/compare/1556409600/1556496000

https://backpack.tf/profiles/76561198256438505#!/compare/1556409600/1556496000

Sale 9: ~71 Keys.

Sold For Holy Grail Taunt: Kazotsky Kick + Catastrophic Companions + Max's Severed Head + Killstreak Batsaber + Purple Confetti Towering Pillar of Hats.

B/O Was 71 Keys - https://bot.tf/stats/listings/MLDKQK84 (Capping)

https://backpack.tf/profiles/76561198256438505#!/compare/1562112000/1562284800

https://backpack.tf/profiles/76561198145069641#!/compare/1474243200/1562284800

Sales: 48/56/67/71

Going with 67-71 keys.

Thanks to scourge for the premium!