Few sales, but fresh sales.

New price: 6-8 keys

Proof:

Sale #1 (3 weeks)= 8

https://backpack.tf/profiles/76561198357046243#!/compare/1530396000/1530482400

Sold for 8 keys.

Sale #2 (3 weeks)= invalid

https://backpack.tf/profiles/76561198799757343#!/compare/1530576000/1530662400

Sold for a strange ks shot in the dark sniper rifle (fn). Better used there.

2 year old price at 10 keys. Has buyers at 7. Supports the range.

Sale #3 (fresh)= 6

https://backpack.tf/profiles/76561198385552241#!/compare/1531440000/1531699200

Sold for 6 keys.

Marketplace.tf sales:

https://marketplace.tf/items/30614;5;u3013

Sale #1 (fresh) Sold for 19.90$. Keys were 1.95$. 19.90 / 1.95 = ~10

_________________________________________________________

SUMMARY

Sales:

6

8

10

https://imgur.com/a/mMvlrRL

Unsold at 10 for 2 months. Excluding 10.

Going with 6-8 keys.

Feel free to add proof to support or counter my new price.