https://backpack.tf/item/7457792090

Sale 1) ?

https://backpack.tf/profiles/76561198035677801#!/compare/1590969600/1591747200

https://backpack.tf/profiles/76561198072553201#!/compare/1590019200/1591228800

Sale 2) Better for the Muffs

https://backpack.tf/profiles/76561198072553201#!/compare/1591660800/1591747200

Sale 3) Quicksold for 130 Keys

https://backpack.tf/profiles/76561198796395930#!/compare/1591660800/1591747200

https://backpack.tf/item/7427588500

Sale 4) Sold for 150 Keys + ~22 Keys of Items

https://backpack.tf/profiles/76561198114402400#!/compare/1586390400/1586563200

150 + 22 = 172, which can be rounded to 170 Keys

https://backpack.tf/item/7245903251

Sale 5) Sold for 125 Keys + Vivid Plasma A Modest Pile of Hat

https://backpack.tf/profiles/76561198156255538#!/compare/1585526400/1585699200

Excluding because of Sale 4.

Sale 6) Quicksold for 131 Keys

https://backpack.tf/profiles/76561198016704189#!/compare/1585699200/1586736000

https://backpack.tf/item/4339754387

Sale 7) Sold for 160 Keys

https://backpack.tf/profiles/76561198080179568#!/compare/1587945600/1588032000

https://backpack.tf/item/8617827872

Sale 8) ?

https://backpack.tf/profiles/76561198071178936#!/compare/1585267200/1585353600

Sale 9) Sold for a Neutron Toadstool (45 Keys) + Pyroland Coldfront (41 Keys) + Violet Doe (35 Keys) + Vivid Pomp (35 Keys) + more

https://backpack.tf/profiles/76561198192602363#!/compare/1587600000/1587686400

https://imgur.com/a/OM0uoDi - Capped by the Buyout of 190 Keys

Toadstool Mini https://backpack.tf/suggestion/5ef1983485acfd615a0c5470

Coldfront Mini https://backpack.tf/suggestion/5ef197ebeaa2172f1d25eab8

Doe Mini https://backpack.tf/suggestion/5ef19809853def24834a7784

Pomp Mini https://backpack.tf/suggestion/5ef1981fbb950474064522f3

https://backpack.tf/item/5035725839

Sale 10) Sold for 185 Keys

https://backpack.tf/profiles/76561198165205268#!/compare/1591488000/1591574400

Goliac bought it off Marketplace for $300 and then sold it for 185 Keys

https://marketplace.tf/items/tf2/30704;5;u100 - Sold for $395.99 when Keys were $1.89 each and $300 when Keys were $1.97 each

395.99 / 1.89 = 209.52, which rounds to 210 Keys

300 / 1.97 = 152.3, which rounds to 152 Keys

https://backpack.tf/item/5035725839 - History of the $300 sale

https://imgur.com/a/OUyNgmO - 2 month seller at 195 Keys suggests 210 is high

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Taking 152 - 190 keys