Sale 1:

Sold for Steaming Industrial Festivizer + 1 key

No outpost

Seller: http://backpack.tf/profiles/76561197978210095#!/compare/1465689600/1465776000

Buyer: http://backpack.tf/profiles/76561198159953813#!/compare/1465776000/1465948800

X = 14

Sale 2:

Quicksold for 10 keys

http://www.tf2outpost.com/trade/28261352 - B/O of 10

Seller: http://backpack.tf/profiles/76561198146579306#!/compare/1465948800/1466035200

Buyer: http://backpack.tf/profiles/76561198062425416#!/compare/1465948800/1466035200

X = 10

Sale 3:

Sold with 1 key + Mannrobics + 42 ref for Disco Beat Down Helmet Without a Home

Seller: http://backpack.tf/profiles/76561198266957896#!/compare/1464393600/1464566400

Buyer: http://backpack.tf/profiles/76561198156145653#!/compare/1464480000/1464566400

Should be used to update the Helmet

Sellers:

12 keys:

http://puu.sh/pMaX9/936075bd91.png - 7 days

http://puu.sh/pMaYo/2028d2471c.png - young

13 keys:

http://puu.sh/pMaZP/e0557ee096.png - 9 days

Sales at:

10

14

Sale at 10 happened too quickly, excluding 10

Sellers at 12 and 13

Going with 12-14