https://backpack.tf/item/5019271340

Sale 1) ?

https://backpack.tf/profiles/76561198134266699#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198275012706#!/compare/1587340800/1587427200

Sale 2) Sold for a Duped Orbiting Planets Exquisite Rack + Disco Beat Down Troublemaker's Tossle Cap (40 Keys)

https://backpack.tf/profiles/76561198275012706#!/compare/1587686400/1587772800

There's no Mini for the Rack. Excluding, but this sale supports the high end.

Sale 3) Better for the Armored

https://backpack.tf/profiles/76561198062503031#!/compare/1587945600/1588118400

https://backpack.tf/item/348056945

Sale 4) Sold for 75 Keys + ~24 Keys of Items + Good-Hearted Goodies Conga (16.5 Keys)

https://backpack.tf/profiles/76561198094964657#!/compare/1582848000/1583366400

75 + 24 + 16.5 = 115.5, which rounds to 115 Keys

Sale 5) Sold for a Misty Skull Private Eye

https://backpack.tf/profiles/76561198098726977#!/compare/1584316800/1584403200

https://backpack.tf/profiles/76561198120672630#!/compare/1584316800/1584403200

Low here and high there.

Sale 6) Sold for a Green Energy Conjurer's Cowl + 45 Keys

https://backpack.tf/profiles/76561198120672630#!/compare/1587600000/1587686400

https://imgur.com/a/IB73t1M - Had a buyout of 88 Keys.

There's no Mini for the Cowl. Excluding, but this sale supports the low end.

https://marketplace.tf/items/tf2/465;5;u13 - Sold for $143.10 when Keys were $1.79 and $159.99 when Keys were $1.80

https://backpack.tf/item/5019271340 - $143.10 history

https://backpack.tf/item/346832241 - $159.99 history

143.10 / 1.79 = 79.9, which rounds to 80 Keys. Low outlier.

159.99 / 1.80 = 88.8, which rounds to 89 Keys.