Sale 1:

https://backpack.tf/profiles/76561199085116273#!/compare/1605052800/1605139200

https://backpack.tf/profiles/76561199085116273#!/compare/1605052800/1605139200

= 24 Keys. (Low)

Sale 2:

https://backpack.tf/profiles/76561198091502579#!/compare/1605052800/1605139200

https://backpack.tf/profiles/76561198163166969#!/compare/1606348800/1606435200

Untrace.

Marketplace.tf: https://marketplace.tf/items/tf2/30907;5;u17

Sale 3:

Nov 12 - $89.99 / $1.79 = 50.27 keys

No B/O

= 50 Keys.

Sale 4:

Nov 27 - $89.99 / $1.76 = 51.13 keys

No B/O

= 51 Keys.

aj: https://backpack.tf/suggestion/601c07dd71851717671b95a1#comment-602ea21c650f9066550550c1

New sales:

Item 1

https://backpack.tf/item/7737714737

Sale 1

https://backpack.tf/profiles/76561198342161127#!/compare/1610064000/1610150400

https://backpack.tf/profiles/76561198042938501#!/compare/1610755200/1610841600

Untrace

Sale 2

https://backpack.tf/profiles/76561198042938501#!/compare/1611532800/1611705600

https://backpack.tf/profiles/76561198453530349#!/compare/1611619200/1611705600

Seems to have sold for 45 keys here

https://gladiator.tf/listings/60110e021d916d1d64e18776 - buyout was 45 keys

Then it appears to have been dumped for buy orders

I suppose both sales can get excluded on that basis

K1ng: https://backpack.tf/suggestion/601c07dd71851717671b95a1#comment-602ea21c650f9066550550c1

Taking in account sale 1 (24 keys), there are three sales below your suggested range. I would at least include 45 to even it out, even though it resold for lower. It seems to have taken a while to sell for that too. 45-51 should be okay.