Sale 1:

Sold for Aces High Tossle Cap (Mini at 17.5 below) + 2 keys + <2 keys in items

No outpost

Seller: http://backpack.tf/profiles/76561198245131174#!/compare/1488758400/1488844800

Buyer: http://backpack.tf/profiles/76561198333257591#!/compare/1488758400/1488844800

X = 21

Sale 2:

Sold with knife skin (2) + ~1 key in metal/items for Peace Sign Fur-lined Fighter (Mini at 20 below)

http://www.tf2outpost.com/trade/28816185 - B/O of 15, re-list of http://www.tf2outpost.com/trade/28815801

Seller: http://backpack.tf/profiles/76561198153095134#!/compare/1488672000/1488758400

Buyer: http://backpack.tf/profiles/76561198245131174#!/compare/1488585600/1488758400

Ignoring the B/O due to how quickly it sold after the trade was made.

X = 17

Peace Sign Fur-Lined Fighter Mini:

http://backpack.tf/suggestion/5915ccfd0e2cad555a03eace

Aces High Tossle Mini:

http://backpack.tf/suggestion/5915c18c0e2cad51023e00da

Sales at:

17

21

No current sellers.

Going with 17-21.