Using last month.

Sale 1:

Sold for Abduction Universal Translator (33)

http://www.tf2outpost.com/trade/29696919 - B/O of 27

Seller: https://backpack.tf/profiles/76561198260651783#!/compare/1530230400/1530316800

Buyer: https://backpack.tf/profiles/76561198101073746#!/compare/1529798400/1530230400

X = 27 (Capped by B/O)

Sale 2:

Sold for 25 keys

Seller: https://backpack.tf/profiles/76561198312583107#!/compare/1529971200/1530057600

Buyer: https://backpack.tf/profiles/76561198065749444#!/compare/1529971200/1530057600

Untraceable. Bot.tf confirms, but it is unreliable. Key histories below:

https://backpack.tf/item/6953616135

https://backpack.tf/item/6953616145

https://backpack.tf/item/6953616162

https://backpack.tf/item/6953616167

https://backpack.tf/item/6953616171

https://backpack.tf/item/6953616178

https://backpack.tf/item/6953616183

https://backpack.tf/item/6953616189

https://backpack.tf/item/6953616200

https://backpack.tf/item/6953616208

https://backpack.tf/item/6953616227

https://backpack.tf/item/6953616244

https://backpack.tf/item/6953616251

https://backpack.tf/item/6953616262

https://backpack.tf/item/6953616270

https://backpack.tf/item/6953616282

https://backpack.tf/item/6953616293

https://backpack.tf/item/6953616305

https://backpack.tf/item/6953616319

https://backpack.tf/item/6953616333

https://backpack.tf/item/6953616346

https://backpack.tf/item/6953616360

https://backpack.tf/item/6953616378

https://backpack.tf/item/6953616389

https://backpack.tf/item/6953616401

X = 25

Sales 3-5:

Sold on marketplace.tf for $44.79, $44.78, and $28

https://marketplace.tf/items/1118;5;u3004

44.79/1.9 = ~23.6

44.78/1.96 = ~22.8

28/1.94 = ~14.4

X = 24

X = 23

X = 14

Sale 6:

Sold to a bot for 16 keys + 2 ref

Seller: https://backpack.tf/profiles/76561198018653729#!/compare/1531699200/1531785600

Buyer: https://backpack.tf/profiles/76561198312583107#!/compare/1531699200/1531785600

Partially untraceable, but bot.tf confirms. Some keys and the ref matches, don’t doubt that anything else was involved.

https://i.imgur.com/6rgCpdB.png

X = 16

Sale 7:

Sold to a bot for 16 keys + 2 ref

Seller: https://backpack.tf/profiles/76561198171023150#!/compare/1531267200/1531440000

Buyer: https://backpack.tf/profiles/76561198312583107#!/compare/1531353600/1531440000

Bot.tf confirms: https://i.imgur.com/6rgCpdB.png

X = 16

Sellers:

25 keys:

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

https://backpack.tf/item/3091849858

Sales at:

14

16 (2x)

23

24

25

27

23-25.