Sale 1:

Sold to a quickbuyer for 90 keys

Seller: https://backpack.tf/profiles/76561198047620031#!/compare/1552953600/1553040000

Buyer: https://backpack.tf/profiles/76561198056793444#!/compare/1552608000/1553040000

https://backpack.tf/item/7621772942

X = 90

Sale 2:

Sold for Burning Defiant Spartan (81.5)

Seller: https://backpack.tf/profiles/76561198061586092#!/compare/1557187200/1557273600

Buyer: https://backpack.tf/profiles/76561198045232326#!/compare/1557100800/1557273600

https://backpack.tf/item/7039813995

X = 82

Marketplace Sales:

https://marketplace.tf/items/30743;5;u62

https://manic.tf/keyprice/?at=2019-03-07 - $179.99 / $1.79 = 100.55 keys, rounding to 100.

https://backpack.tf/item/5042803053 - no B/O

X = 100

Other Sales:

https://backpack.tf/item/4553068884 (#1 & #2, excluded gambling)

#1

Gambled/scammed

https://backpack.tf/profiles/76561198007743321#!/compare/1553299200/1553644800

https://backpack.tf/profiles/76561198874599915#!/compare/1553299200/1553385600

#2

Untraceable

https://backpack.tf/profiles/76561198132450305#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198337734785#!/compare/1557532800/1557619200

Sellers:

https://i.imgur.com/RmLlrqR.png

https://backpack.tf/item/7039813995 - 96 keys

https://backpack.tf/item/4553068884 - 97 keys

https://backpack.tf/item/7621772942 - 130 keys

Sales at:

82

90

100

https://i.imgur.com/OSOFrum.png - buyer at 82, excluding 82.

90 is a sale to a buy order, but given the next highest sale being higher than current sellers, it shouldn’t be excluded. the cheaper sale supports the inclusion of 90 too.

100 is a little higher than the current sellers, but the next lowest sale is the sale to the quickbuyer, so 100 shouldn’t be excluded here. Both these sales should balance them being low and high out.

Going with 90-100.