Resuggesting due to new sales occurring.

Sale 1: Sold for 11 keys

https://backpack.tf/profiles/76561198450169432#!/compare/1565654400/1566086400

https://backpack.tf/profiles/76561198394877897#!/compare/1566000000/1566086400

Sale 2: Scammed

https://backpack.tf/profiles/76561198082751158#!/compare/1568678400/1569196800

https://backpack.tf/profiles/76561198982013045#!/compare/1569110400/1569283200

Sale 3: Bulk

https://backpack.tf/profiles/76561198046841396#!/compare/1566432000/1566518400

https://backpack.tf/profiles/76561198050745352#!/compare/1566432000/1566518400

Sale 4: Sold for 10 keys?

https://backpack.tf/profiles/76561198084686265#!/compare/1566432000/1566518400

https://backpack.tf/profiles/76561198303886984#!/compare/1566432000/1566518400

Histories dont seem to match.

Sale 5: Unknown

https://backpack.tf/profiles/76561198303886984#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198273681900#!/compare/1568073600/1568160000

Sale 6: Unknown

https://backpack.tf/profiles/76561198825848629#!/compare/1563840000/1565136000

https://backpack.tf/profiles/76561198129826792#!/compare/1563580800/1564272000

Sale 7: Sold for 18 keys?

https://backpack.tf/profiles/76561198394877897#!/compare/1562371200/1562457600

https://backpack.tf/profiles/76561198044338428#!/compare/1561593600/1563408000

Histories dont match.

Sale 8: Sold to a quickbuyer for?

https://backpack.tf/profiles/76561198095862827#!/compare/1570924800/1571097600

https://backpack.tf/profiles/76561198337734785#!/compare/1571097600/1571011200

Likely at the buyers price of 8 keys + 15 ref

https://bot.tf/stats/listings/MNL8D31Q

Sale 9: Looks like bulk to me

https://backpack.tf/profiles/76561198394877897#!/compare/1573084800/1573171200

https://backpack.tf/profiles/76561198394877897#!/compare/1573084800/1573171200

Sale 10, 11 & 12

11.01 on october 11

27 on october 15

17 on october 25

https://marketplace.tf/items/tf2/439;5;u58

https://backpack.tf/item/7956501607

https://backpack.tf/item/2183612968

11.01/1.81 = 6.08 rounding to 6 keys

27/1.83 = 14.75 rounding to 15 keys

17/1.8 = 9.44 rounding to 9.5 keys

Classifieds:

https://gyazo.com/02db7d0ca42dc62f76e162e8df135455

These two bots have been selling at the listed price for quite awhile

https://bot.tf/stats/listings/4OVW223V

https://bot.tf/stats/listings/M17RD7VO

https://bot.tf/stats/listings/M17R1JQO

Conclusion:

Sale at 11. Marketplace sales at 6, 9.5, and 15. Unconfirmed sales at 10 and 18.

6 is low due to buyers at 8. 11 and 15 are high due to sellers at 10.

Taking 9.5 keys.