Sale 1:

Sold for 13 keys + ~1 key in items

No outpost

Seller: https://backpack.tf/profiles/76561198132204288#!/compare/1505520000/1505606400

Buyer: https://backpack.tf/profiles/76561198047401076#!/compare/1505606400/1505692800

X = 14

Sale 2:

Sold for Well-Worn Isotope Low Profile SMG (14)

No outpost

Seller: https://backpack.tf/profiles/76561198158206236#!/compare/1502496000/1502582400

Buyer: https://backpack.tf/profiles/76561198197708585#!/compare/1502496000/1502582400

X = 14

Sale 3:

Sold for 12 keys

No outpost

Seller: https://backpack.tf/profiles/76561198211000936#!/compare/1504137600/1504224000

Buyer: https://backpack.tf/profiles/76561198054716808#!/compare/1504137600/1504224000

X = 12

Sale 4:

Sold for 11 keys

http://www.tf2outpost.com/trade/29331402 - No B/O

Seller: https://backpack.tf/profiles/76561198050062763#!/compare/1503187200/1503273600

Buyer: https://backpack.tf/profiles/76561198177091262#!/compare/1503187200/1503273600

X = 11

Sale 5:

Sold for 11 keys

No B/Os on outpost

Seller: https://backpack.tf/profiles/76561198125791160#!/compare/1504396800/1504483200

Buyer: https://backpack.tf/profiles/76561198132204288#!/compare/1503964800/1504483200

X = 11

Sale 6:

Bulk for Terror-Watt Boxcar

Seller: https://backpack.tf/profiles/76561198159690821#!/compare/1502928000/1503014400

Buyer: https://backpack.tf/profiles/76561198162282453#!/compare/1502928000/1503014400

Sale 7:

Sold with items for Dead Presidents Samur-Eye

Seller: https://backpack.tf/profiles/76561198170186586#!/compare/1501977600/1502064000

Buyer: https://backpack.tf/profiles/76561198158206236#!/compare/1501891200/1501977600

Should be used on the Samur-Eye.

Sales at:

11 (2x)

12

14 (2x)

No current sellers.

Going with 11-14.