Resuggestion from https://backpack.tf/suggestion/5fcbd5428ea2b03e10020d02

https://backpack.tf/profiles/76561198431601848#!/compare/1599350400/1599436800

https://backpack.tf/profiles/76561198106511423#!/compare/1599350400/1599436800

65 keys

https://backpack.tf/profiles/76561198106511423#!/compare/1600387200/1600473600

https://backpack.tf/profiles/76561198208823517#!/compare/1600473600/1600560000

Bulk

https://backpack.tf/profiles/76561198208823517#!/compare/1602892800/1603584000

https://backpack.tf/profiles/76561199086457409#!/compare/1603497600/1603584000

Untraceable

https://backpack.tf/profiles/76561198115721685#!/compare/1601164800/1601251200

https://backpack.tf/profiles/76561198014801788#!/compare/1600819200/1601251200

Untraceable

https://backpack.tf/profiles/76561198014801788#!/compare/1601251200/1601337600

https://backpack.tf/profiles/76561198052116405#!/compare/1601251200/1601337600

Looks like sold alongside other unusuals for bulk keys

https://backpack.tf/profiles/76561198052116405#!/compare/1602201600/1602288000

https://backpack.tf/profiles/76561198970722371#!/compare/1602201600/1602288000

Untraceable

https://backpack.tf/profiles/76561198970722371#!/compare/1604448000/1604620800

https://backpack.tf/profiles/76561198088707185#!/compare/1604534400/1604620800

Untraceable

https://marketplace.tf/items/tf2/315;5;u36

$180 / $1.84 = 97.83 keys

$249.99 / $1.76 = 142.04 keys

Information by https://backpack.tf/u/76561198061108999

with sales at 65, 98, and 142, 142 seems as much of an outlier as 65. i would exclude both of them here and go 98 flat.

there was also this seller for a bit (was also there on 9 dec but snapshot doesn't go that far):

https://backpack.tf/item/531043521

https://gladiator.tf/listings/5fd544f18ef263a941a711f0 - 115 keys

https://gladiator.tf/listings/5fd696c01de83009476faa28 - lowered to 110 keys

Going with just 98 flat