Sale 1:

Sold for 15 keys + Strange Pro. KS Brass Beast (>1.5)

Seller doesn’t list B/O’s on outpost.

Seller: http://backpack.tf/profiles/76561198011321852#!/compare/1490832000/1490918400

Buyer: http://backpack.tf/profiles/76561198054147366#!/compare/1490918400/1491004800

X = 17

Sale 2:

Sold for 9 keys in ~3-4 days

http://www.tf2outpost.com/trade/28848501 - B/O of 16

Seller: http://backpack.tf/profiles/76561198146600196#!/compare/1490486400/1490572800

Buyer: http://backpack.tf/profiles/76561198011321852#!/compare/1490400000/1490486400

X = 9

Other sales:

Seller: http://backpack.tf/profiles/76561198112331037#!/compare/1490140800/1490227200

Buyer: http://backpack.tf/profiles/76561198146600196#!/compare/1490140800/1490227200

No idea what it sold for here. None of the histories match.

These are all the movements in the last 3 months that I could trace.

Sales at:

9

17

No current sellers.

Buyer at 9 keys:

http://i.imgur.com/4R7Ftwv.png

Excluding 9.

Going with 17.