Sale 1:

Sold for Cloud 9 Halogen Head Lamp (Mini at 18 below) + 7 keys + <0.5 keys in metal/items

http://www.tf2outpost.com/trade/28773338 - B/O of 28

Seller: http://backpack.tf/profiles/76561198192740165#!/compare/1486771200/1487462400

Buyer: http://backpack.tf/profiles/76561198053798945#!/compare/1487376000/1487462400

X = 25

Sale 2:

Sold with a key for Circling Heart Ol’ Snaggletooth (Mini at 21.5 below)

http://www.tf2outpost.com/trade/28813032 - B/O of 28

Seller: http://backpack.tf/profiles/76561198274999756#!/compare/1488585600/1488672000

Buyer: http://backpack.tf/profiles/76561197964171516#!/compare/1488585600/1488672000

X = 21

Sale 3:

Sold for 20 keys

No outpost

Seller: http://backpack.tf/profiles/76561198133875209#!/compare/1488499200/1488585600

Buyer: http://backpack.tf/profiles/76561198274999756#!/compare/1488499200/1488585600

X = 20

Circling Heart Ol’ Snaggletooth:

http://backpack.tf/suggestion/590c57f8e3387764b05c1daa

Cloud 9 Headlamp Mini:

http://backpack.tf/suggestion/590c64d0e338777bf1771b6c

Sellers:

27 keys:

http://i.imgur.com/PQXYPnB.png - 9 days

http://backpack.tf/u/76561197964171516

http://www.tf2outpost.com/trade/28895097

Sales at:

20

21

25

Unsure of the low-end, there’s a buyer at 19 here:

http://www.tf2outpost.com/trade/26755791 - not sure when it was updated last, though.

Going with 20-25.