Using last 2 months.

Sale 1:

Sold for 10 keys (Buyer’s compare link)

Seller: https://backpack.tf/profiles/76561198344933095#!/compare/1521417600/1521504000

Buyer: https://backpack.tf/profiles/76561198415173853#!/compare/1521504000/1521676800

Bot.tf confirms: https://i.imgur.com/URAC8Jz.png

X = 10

Sale 2:

Sold for 9 keys + 10 ref

Seller: https://backpack.tf/profiles/76561198344933095#!/compare/1522368000/1522454400

https://backpack.tf/item/3916592706 - Buyer is untraceable. It wasn’t Impressive, as they got it a few days later.

Untraceable, but bot.tf confirms: https://i.imgur.com/URAC8Jz.png

X = 9.5

Sale 3:

Sold for 8 keys

Seller: https://backpack.tf/profiles/76561198277767530#!/compare/1521504000/1521590400

Buyer: https://backpack.tf/profiles/76561198813270454#!/compare/1521417600/1521590400

X = 8

Sale 4:

Quicksold for 8 keys

Seller: https://backpack.tf/profiles/76561198172136521#!/compare/1523318400/1523404800

Buyer: https://backpack.tf/profiles/76561198404076558#!/compare/1523145600/1523318400

X = 8

Sale 5:

Quicksold for 7 keys

Seller: https://backpack.tf/profiles/76561198813270454#!/compare/1523232000/1523318400

Buyer: https://backpack.tf/profiles/76561198172136521#!/compare/1522972800/1523318400

X = 7

Sellers:

~9.4 keys:

https://i.imgur.com/5nn43ge.png

https://backpack.tf/item/5718174212

12 keys:

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

https://backpack.tf/item/3916592706

Sales at:

7

8 (2x)

9.5

10

I’m pretty sure 8 was quickbuy price about a month ago, hence the amount of sales at around that price. Given that these quickbuyers have dropped their prices now, it should be safe to include 8 in the range. I’ll also be including 10, with the seller at ~9.5 keys, with 8 being a little low, and 10 being a little high, both those should balance it out a bit.

Also, I’ll be excluding 7 because that sale’s a little too low here, and quicksold.

Going with 8-10.