Sale 1:

Sold for 54 keys. Keys were spent on the Beams Toque later.

Seller: https://backpack.tf/profiles/76561198313538268#!/compare/1533254400/1533340800

Buyer: https://backpack.tf/profiles/76561198136910509#!/compare/1533340800/1535241600

https://backpack.tf/item/196398343

https://i.imgur.com/hvIy7lk.png

X = 54

Sale 2:

Sold for Duped Green Energy Reggaelator + Genuine Robo-Sandvich

http://www.tf2outpost.com/trade/29764953 - B/O of 50

Seller: https://backpack.tf/profiles/76561198018528305#!/compare/1536278400/1536451200

Buyer: https://backpack.tf/profiles/76561197994071579#!/compare/1536278400/1536451200

EASILY caps.

X = 50 (Capped by B/O)

Sale 3:

Quicksold for 43 keys

Seller: https://backpack.tf/profiles/76561198316071886#!/compare/1535241600/1535328000

Buyer: https://backpack.tf/profiles/76561198043766709#!/compare/1535241600/1535328000

https://backpack.tf/item/225781233

X = 43

Sale 4:

Sold for 41 keys

Seller: https://backpack.tf/profiles/76561198091539797#!/compare/1535155200/1535328000

Buyer: https://backpack.tf/profiles/76561198316071886#!/compare/1535241600/1535328000

https://backpack.tf/item/225781233

X = 41

Sellers:

https://i.imgur.com/r3khbuK.png

https://backpack.tf/item/332477016 - 52 keys, duped

https://backpack.tf/item/5315085117 - 70 keys

https://backpack.tf/item/332063544 - 70 keys, duped

Other Sales:

Bulk for Burning Rack

https://backpack.tf/profiles/76561198055721127#!/compare/1534809600/1534896000

https://backpack.tf/profiles/76561198091539797#!/compare/1534464000/1534896000

Sales at:

41

43

50

54

43 quicksold, so I’ll keep 43 and exclude 41, as there isn’t really anything that counters either of those sales.

Going with 43-54.