Sale 1:

Sold for 15 keys

No outpost

Seller; http://backpack.tf/profiles/76561198074924284#!/compare/1492819200/1492905600

Buyer: http://backpack.tf/profiles/76561198065246181#!/compare/1492905600/1493769600

X = 15

Sale 2:

Sold for 12 keys in ~3 days

No outpost

Seller: http://backpack.tf/profiles/76561198316193894#!/compare/1487635200/1487721600

Buyer: http://backpack.tf/profiles/76561198236255712#!/compare/1487721600/1488067200

X = 12

Sale 3:

Sold with rocket launcher skin (2) for Logo Raincatcher

Seller: http://backpack.tf/profiles/76561198065246181#!/compare/1494460800/1494547200

Buyer: http://backpack.tf/profiles/76561198109078898#!/compare/1494374400/1494547200

Should be used on the Raincatcher

Sellers:

16 keys:

http://i.imgur.com/avtWYSK.png - young

http://backpack.tf/u/76561198109078898

http://www.tf2outpost.com/trade/29175104

17 keys:

http://i.imgur.com/lcn1JMy.png - 5 days

http://backpack.tf/u/76561198043936328

http://www.tf2outpost.com/trade/28973190

Sales at:

12

15

12 sold kinda quickly, and there are buyers for a little more than 12 on the classifieds:

http://i.imgur.com/t5EOpvC.png

Excluding 12.

Going with 15 flat.