Sale 1:

Sold for Dead Presidents Helmet Without a Home (13.5) + <0.5 keys in items

Seller: http://backpack.tf/profiles/76561198048851745#!/compare/1495065600/1495152000

Buyer: http://backpack.tf/profiles/76561198198090537#!/compare/1495065600/1495238400

Helmet is being re-sold by the seller at 11 keys. Going to cap the sale at that.

X = 11 (Capped by B/O)

Sale 2:

Sold for Vivid Plasma Dread Knot (14) + taunt (<0.5)

http://www.tf2outpost.com/trade/28897536 - B/O of 11

Seller: http://backpack.tf/profiles/76561198055813463#!/compare/1493251200/1493337600

Buyer: http://backpack.tf/profiles/76561198084361948#!/compare/1493251200/1493337600

X = 11 (Capped by B/O)

Sale 3:

Sold in ~1-4 days for 10 keys

No outpost

Seller: http://backpack.tf/profiles/76561198120655846#!/compare/1494806400/1495238400

Buyer: http://backpack.tf/profiles/76561198220068393#!/compare/1494547200/1495152000

X = 10

Sale 4:

Sold for 9 keys + 15 ref (>0.5) in ~1-2 days

http://www.tf2outpost.com/trade/29214136 - Deleted B/O

Seller: http://backpack.tf/profiles/76561198048008254#!/compare/1496620800/1496707200

Buyer: http://backpack.tf/profiles/76561198065149082#!/compare/1496620800/1496707200

X = 10

Sale 5:

Sold for 9 keys + 17 ref (>0.5) in ~3 days

No outpost

Seller: http://backpack.tf/profiles/76561198304138933#!/compare/1490572800/1490659200

Buyer: http://backpack.tf/profiles/76561198083102991#!/compare/1490659200/1490745600

X = 10

Sale 6:

Sold for 9 keys + <0.5 keys in items in ~2-3 days

No outpost

Seller: http://backpack.tf/profiles/76561198083102991#!/compare/1491004800/1491264000

Buyer: http://backpack.tf/profiles/76561198142603321#!/compare/1490745600/1491264000

X = 9

Sale 7:

Sold for 9 keys in ~7 days

http://www.tf2outpost.com/trade/28869059 - B/O of 9

Seller: http://backpack.tf/profiles/76561198191605091#!/compare/1492387200/1492473600

Buyer: http://backpack.tf/profiles/76561198137531056#!/compare/1491696000/1492646400

X = 9

Sale 8:

Sold in ~3 days for 7 keys + ~2 keys in taunts

Seller: http://backpack.tf/profiles/76561198296168912#!/compare/1494460800/1494547200

Buyer: http://backpack.tf/profiles/76561198199137138#!/compare/1494460800/1494547200

X = 9

Sale 9:

Quicksold for 9 keys + 10 ref (Buyer’s compare link)

http://www.tf2outpost.com/trade/29177052 - Deleted B/O

Seller: http://backpack.tf/profiles/76561198337734785#!/compare/1494633600/1494720000

Buyer: http://backpack.tf/profiles/76561198120655846#!/compare/1494720000/1494806400

X = 9

Sale 10:

Sold for Australium Blutsauger (7) + ~2 keys in items

No outpost

Seller: http://backpack.tf/profiles/76561198220068393#!/compare/1495756800/1495843200

Buyer: http://backpack.tf/profiles/76561198092344052#!/compare/1495670400/1495756800

X = 9

Sale 11:

Quicksold for 8 keys + 4 ref

No outpost

Seller: http://backpack.tf/profiles/76561198118634609#!/compare/1493942400/1494028800

Buyer: http://backpack.tf/profiles/76561198048851745#!/compare/1493856000/1494028800

X = 8

Sale 12:[/]

[b]Sale 13:

Sold for Dead Presidents Dead Cone

http://www.tf2outpost.com/trade/28866614 - B/O of 11

Seller: http://backpack.tf/profiles/76561198142603321#!/compare/1491609600/1491696000

Buyer: http://backpack.tf/profiles/76561198191605091#!/compare/1491523200/1491609600

Can be used on the cone

Sale 14:

Sold for Steaming Doctor’s Sack + 1 ref

No outpost

Seller: http://backpack.tf/profiles/76561198046838348#!/compare/1493164800/1493251200

Buyer: http://backpack.tf/profiles/76561198055813463#!/compare/1493078400/1493251200

Can be used on the sack

Sales at:

8

9 (5x)

10 (3x)

11 (2x)

No current sellers.

8 is countered by buyers:

http://i.imgur.com/QxRg8Xg.png

Excluding 8.

Majority of the sales at 9 and 10 quicksold, however, they occur way too frequently to be ignored. I will, however, knock 9 out of the range.

Going with 10-11.