Sale 1: 74 keys (Low) Sold with 6 keys for a Roboactive Armored Authority (80 keys) { 80 - 6 = 74 }

https://backpack.tf/profiles/76561198037434271#!/compare/1561766400/1561852800

Sale 2: 117 keys (High) Bought with an Antifreeze Grenadier's Softcap (87 keys) + 29 keys + Spec.KS Grenade kit (1 key) { 87 + 29 + 1 = 117 }

https://backpack.tf/profiles/76561198053409340#!/compare/1561420800/1561593600

Sale 3: 80 keys (Mid) Bought with 20 keys + Time Warp Otolaryngologist's Mirror (70 keys) for Amaranthine Black Watch + 10 keys in items { 20 + 70 - 10 = 80 }

https://backpack.tf/profiles/76561198410760897#!/compare/1546473600/1546560000

Outlier is Sale 2