Sale 1:

Sold for Spectral Swirl Battin’ (16.5) + cheap cosmetics and stuff

No outpost

Seller: https://backpack.tf/profiles/76561198059769005#!/compare/1499385600/1499472000

Buyer: https://backpack.tf/profiles/76561198057740823#!/compare/1499385600/1499472000

X = 17

Sale 2:

Sold for Pro. KS Aussie Blutsauger (7.5) + Spec. KS Strange Pan (<6.5) + Pro. KS Festive Spy-cicle (<2.5)

http://www.tf2outpost.com/trade/29226556 - B/O of 16

Seller: https://backpack.tf/profiles/76561198232041512#!/compare/1497657600/1497830400

Buyer: https://backpack.tf/profiles/76561198174464682#!/compare/1497744000/1497830400

X = 16 (Capped by B/O)

Sale 3:

Sold for Dead Presidents Scotsman’s Stove Pipe (Suggestion at 14) + ~1 key in items

No outpost

Seller: https://backpack.tf/profiles/76561198117257215#!/compare/1498608000/1498694400

Buyer: https://backpack.tf/profiles/76561198060826499#!/compare/1498521600/1498608000

X = 15

Sale 4:

Sold for Kill-a-Watt Sultan’s Ceremonial (11.5) + <2 keys in items

http://www.tf2outpost.com/trade/29255464 - B/O of 13

Seller: https://backpack.tf/profiles/76561198015384426#!/compare/1498867200/1498953600

Buyer: https://backpack.tf/profiles/76561198188461649#!/compare/1498780800/1498953600

X = 13 (Capped by B/O)

Sale 5:

Sold with 3 keys for Orbiting Fire L’Homme Burglerre

Seller: https://backpack.tf/profiles/76561198188461649#!/compare/1499212800/1499472000

Buyer: https://backpack.tf/profiles/76561198059769005#!/compare/1499299200/1499472000

Better used on the Burg.

Dead Presidents Scotsman’s Stove Pipe Suggestion:

https://backpack.tf/suggestion/5970f28ecf6c7524354a4552

Sellers:

17 keys:

http://i.imgur.com/ztXapoV.png - 8 days

Sales at:

13

15

16

17

Buyer at 13+ keys:

http://i.imgur.com/8wfYwJX.png

Excluding 13.

Going with 15-17.