Sales 1:

Sold for 13 keys, and traded back on the same day

Seller: https://backpack.tf/profiles/76561198341171690#!/compare/1548806400/1548892800

Buyer: https://backpack.tf/profiles/76561198869716665#!/compare/1548806400/1548892800

https://backpack.tf/item/6999249345

The trade-back is untraceable

X = 13

Sale 2:

Sold with Mannrobics (~1) + ~1 key in items for Pro. KS Diamond Botkiller Rocket Launcher w/ exorcism (14)

Seller: https://backpack.tf/profiles/76561198869407142#!/compare/1551052800/1551312000

Buyer: https://backpack.tf/profiles/76561197971854756#!/compare/1551225600/1551312000

https://backpack.tf/item/7203891748

https://backpack.tf/item/1758245818 - The RL re-sold in the seller’s compare link for 14 keys. (7591403562) near ID to confirm the keys.

X = 12

Sale 3:

Sold for 12 keys + a small amount of metal

Seller: https://backpack.tf/profiles/76561198048851745#!/compare/1552435200/1552521600

Buyer: https://backpack.tf/profiles/76561198150014395#!/compare/1552521600/1552780800

https://backpack.tf/item/7203891748

X = 12

Sale 4:

Sold to a quickbuyer for 11 keys + less than half a key in metal (Buyer’s end)

Seller: https://backpack.tf/profiles/76561197971854756#!/compare/1551225600/1551312000

Buyer: https://backpack.tf/profiles/76561198048851745#!/compare/1551225600/1551312000

https://backpack.tf/item/7203891748

X = 11

Other Sales:

https://backpack.tf/item/7505547242 (#1)

https://backpack.tf/item/7212590162 (#2 & #3)

https://backpack.tf/item/7203891748 (#4)

https://backpack.tf/item/6999249345 (#5 & #6)

https://backpack.tf/item/6908020493 (#7)

https://backpack.tf/item/6740189018 (#8)

#1

Sold with ~1 key in items for Aussie Frontier Justice

https://backpack.tf/profiles/76561198096239568#!/compare/1549929600/1550016000

https://backpack.tf/profiles/76561198034732229#!/compare/1549843200/1549929600

Waaaay too low, excluding.

#2

Sold for Terror-Watt L’inspecteur

https://backpack.tf/profiles/76561198336763890#!/compare/1546560000/1550016000

https://backpack.tf/profiles/76561198119149660#!/compare/1548288000/1548374400

Using on the terror-watt hat as it doesn’t have any other usable sales.

#3

Untraceable

https://backpack.tf/profiles/76561198119149660#!/compare/1548374400/1548460800

https://backpack.tf/profiles/76561198198376499#!/compare/1548979200/1552435200

No mini available

#4

Untraceable, only some keys match

https://backpack.tf/profiles/76561198048851745#!/compare/1550966400/1551052800

https://backpack.tf/profiles/76561198869407142#!/compare/1550880000/1550966400

#5

Untraceable

https://backpack.tf/profiles/76561198850683642#!/compare/1546819200/1546905600

https://backpack.tf/profiles/76561198341171690#!/compare/1546732800/1546819200

#6

Untraceable

https://backpack.tf/profiles/76561198341171690#!/compare/1550361600/1550448000

Buyer can’t be traced, dumped in some bot before being scanned in their backpack.

https://i.imgur.com/xI5KkFy.png - labelled as 13 keys.

#7

Sold for 13 keys?

https://backpack.tf/profiles/76561198341171690#!/compare/1550793600/1550880000

https://backpack.tf/profiles/76561198142962201#!/compare/1550793600/1550880000 - likely buyer

https://i.imgur.com/xI5KkFy.png - labelled as 13 keys.

Same story as the one above.

#8

Sold for Brain Drain Highway Star

https://backpack.tf/profiles/76561198129027061#!/compare/1554163200/1554249600

https://backpack.tf/profiles/76561198232041512#!/compare/1554163200/1554249600

Can be used on the Highway star.

Sellers:

https://i.imgur.com/9j0pP0d.png

https://backpack.tf/item/6740189018 - 13 keys

Sales at:

11

12 (2x)

13

11 went to a quickbuyer, excluding 11.

Don’t wanna exclude 13 for being a tradeback, given the two other bot.tf sales at 13. They may be (somewhat) untraceable, but I highly doubt that they are incorrect, especially #7.

Going with 12-13.