Sale 1:

Sold for $20.39 on Marketplace.tf

https://marketplace.tf/items/313;5;u33

https://backpack.tf/item/801465053

20.39/1.95 = ~10.45

X = 10

Sale 2:

Sold for 9 keys

No outpost

Seller: https://backpack.tf/profiles/76561198413211305#!/compare/1506038400/1506124800

Buyer: https://backpack.tf/profiles/76561198274139380#!/compare/1505952000/1506038400

X = 9

Sale 3:

Sold for 9 keys

http://www.tf2outpost.com/trade/29309155 - B/O of 9

Seller: https://backpack.tf/profiles/76561198159855421#!/compare/1502150400/1502236800

Buyer: https://backpack.tf/profiles/76561198336559852#!/compare/1502150400/1502236800

X = 9

Sale 4:

Sold for 8 keys and a couple ref to a bot

Seller: https://backpack.tf/profiles/76561198115181281#!/compare/1502755200/1502841600

Buyer: https://backpack.tf/profiles/76561198296062531#!/compare/1502755200/1502841600

X = 8

Sale 5:

Sold for 8 keys + 4.88 ref to a bot

Seller: https://backpack.tf/profiles/76561198126693824#!/compare/1506211200/1506297600

Buyer: https://backpack.tf/profiles/76561198316961222#!/compare/1506211200/1506297600

X = 8

Sale 6:

Sold for Cloud 9 Pugilist’s Protector

No outpost

Seller: https://backpack.tf/profiles/76561198263923116#!/compare/1505606400/1505779200

Buyer: https://backpack.tf/profiles/76561198355192150#!/compare/1505520000/1505606400

Can be used on the C9 Pug

Sale 7:

Sold with ~2 keys in items for Terror-Watt Birdcage (14)

No outpost

Seller: https://backpack.tf/profiles/76561198355192150#!/compare/1505606400/1506038400

Buyer: https://backpack.tf/profiles/76561198413211305#!/compare/1506038400/1506124800

Sale will be really high without a B/O cap. Excluding this sale.

Sale 8:

Sold for a lot of items

Seller: https://backpack.tf/profiles/76561198274139380#!/compare/1506470400/1506643200

Buyer: https://backpack.tf/profiles/76561198261789206#!/compare/1506297600/1506643200

Shouldn’t use this sale to get an exact value.

Sale 9:

Sold for ~13 keys in items/metal

No outpost

Seller: https://backpack.tf/profiles/76561198274139380#!/compare/1507248000/1507334400

Buyer: https://backpack.tf/profiles/76561198246145390#!/compare/1507334400/1507420800 (no proper link available)

Not using without a B/O, would be too high.

Sellers:

8.5 keys:

https://i.imgur.com/uDtSu3N.png

And 3 on marketplace for ~10 keys

Sales at:

8 (2x)

9 (2x)

10

https://i.imgur.com/523ERyq.png - Cached link shows one going unsold for 2 months at 9 keys before being put up on marketplace.tf

https://backpack.tf/item/3345357542

Excluding anything higher than 9.

Sells for 8 often, and seller at 8.5 shows that 9 flat is too high.

Going with 8-9.