Sale 1:

Sold for 8 keys + 2 ref

Seller: https://backpack.tf/profiles/76561198048851745#!/compare/1551312000/1551398400

Buyer: https://backpack.tf/profiles/76561198841365001#!/compare/1551312000/1551398400

https://backpack.tf/item/5398909714

X = 8

Sale 2:

Sold to a bot for 7 keys + 23 ref

Seller: https://backpack.tf/profiles/76561198091502579#!/compare/1546387200/1546473600

Buyer: https://backpack.tf/profiles/76561198155110999#!/compare/1546387200/1546473600

https://backpack.tf/item/1333647636

X = 7.5

Sale 3:

Sold to a quickbuyer for 7 keys + ~0.5 keys in metal (Buyer’s end)

Seller: https://backpack.tf/profiles/76561198071711499#!/compare/1546905600/1546992000

Buyer: https://backpack.tf/profiles/76561198048851745#!/compare/1546905600/1546992000

https://backpack.tf/item/5398909714

X = 7.5

Sale 4:

Sold for 7 keys + 21 ref

Seller: https://backpack.tf/profiles/76561198029656594#!/compare/1548374400/1548460800

Buyer: https://backpack.tf/profiles/76561198335791307#!/compare/1548374400/1548460800

https://backpack.tf/item/442126384

X = 7.5

Other Sales:

https://backpack.tf/item/5398909714 (#1-4)

https://backpack.tf/item/442126384 (#5 & #6)

https://backpack.tf/item/1358267527 - scammer

https://backpack.tf/item/5844418135 - some bot service thing

https://backpack.tf/item/528837485 - some bot service thing

https://backpack.tf/item/463418395 - some bot service things

#1

Bulk for Purple Confetti Tundra Top

https://backpack.tf/profiles/76561198825833809#!/compare/1545177600/1545609600

https://backpack.tf/profiles/76561198024867201#!/compare/1545523200/1545609600

#2

Untraceable

https://backpack.tf/profiles/76561198024867201#!/compare/1546300800/1546387200

https://backpack.tf/profiles/76561198248059696#!/compare/1544486400/1546387200

#3

Bulk?

https://backpack.tf/profiles/76561198248059696#!/compare/1546560000/1546819200

https://backpack.tf/profiles/76561198071711499#!/compare/1546732800/1546819200

#4

Untraceable

https://backpack.tf/profiles/76561198841365001#!/compare/1551312000/1551398400

https://backpack.tf/profiles/76561198341171690#!/compare/1551312000/1551398400

#5

Untraceable

https://backpack.tf/profiles/76561198048851745#!/compare/1547942400/1548028800

https://backpack.tf/profiles/76561198429587621#!/compare/1547942400/1548028800

Only some keys appear. Clearly missing some.

#6

Untraceable

https://backpack.tf/profiles/76561198429587621#!/compare/1548374400/1548460800

https://backpack.tf/profiles/76561198029656594#!/compare/1548374400/1548460800

Sellers:

https://i.imgur.com/Xhz3lnt.png

https://backpack.tf/item/442126384 - ~8.1 keys

https://backpack.tf/item/5398909714 - ~8.1 keys

https://backpack.tf/item/773685020 - ~8.1 keys

Sales at:

7.5 (3x)

8

Way too many sales at 7.5 to be excluded. Keeping 7.5.

Going with 7.5-8.