Sale 1:

Sold for Neutron Star Baron Von Havenaplane (Mini at 24.5 below) Strange Pro. KS Quick Fix (4.5) + Buds (<2)

No outpost

Seller: http://backpack.tf/profiles/76561198066434918#!/compare/1488067200/1488240000

Buyer: http://backpack.tf/profiles/76561198076514342#!/compare/1488240000/1488672000

X = 31

Sale 2:

Sold for Blizzardy Soldered Sensei (27)

No outpost

Seller: http://backpack.tf/profiles/76561198155830521#!/compare/1487376000/1487462400

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

X = 27

Sale 3:

Sold for Purple Energy Elf Esteem (25.5)

http://webcache.googleusercontent.com/search?q=cache:qqXkLdDsFmoJ:www.tf2outpost.com/trade/28871048+&cd=1&hl=en&ct=clnk&gl=au – B/O of 20 (I worked out the cache thing :P)

Seller: http://backpack.tf/profiles/76561198068732040#!/compare/1492473600/1492560000

Buyer: http://backpack.tf/profiles/76561198339794645#!/compare/1492473600/1492646400

X = 20 (Capped by B/O)

Sale 4:

Sold for $40 on Marketplace.tf

https://marketplace.tf/items/30041;5;u58

http://backpack.tf/item/3013182284

Buyer: http://backpack.tf/profiles/76561198370591649#!/compare/1490486400/1490918400

40/2.1

X = 19

Sale 5:

Sold for Orbiting Fire Flipped Trilby (16)

No outpost

Seller: http://backpack.tf/profiles/76561198339794645#!/compare/1493251200/1493942400

Buyer: http://backpack.tf/profiles/76561198079206305#!/compare/1493251200/1493337600

X = 16

Sale 6:

Sold for 16 keys

No outpost

Seller: http://backpack.tf/profiles/76561198131014883#!/compare/1486771200/1486857600

Buyer: http://backpack.tf/profiles/76561198155830521#!/compare/1486771200/1486857600

X = 16

Sale 7:

Sold for 14 keys to my buy order

Seller: http://backpack.tf/profiles/76561198095680302#!/compare/1488240000/1488326400

Buyer: http://backpack.tf/profiles/76561198021055079#!/compare/1488240000/1488326400

X = 14

Sale 8:

Bulk for Slumber Law

Seller: http://backpack.tf/profiles/76561198192740165#!/compare/1487462400/1487548800

Buyer: http://backpack.tf/profiles/76561198066434918#!/compare/1487462400/1487548800

Neutron Star Baron Von Havenaplane:

http://backpack.tf/suggestion/590c62b90e2cad74fa137908

Sellers:

20 keys:

http://i.imgur.com/zO9k02b.png - 2 months (hey that me)

http://backpack.tf/u/76561198021055079

http://www.tf2outpost.com/trade/28901544

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

http://backpack.tf/u/76561198079206305

Sales at:

14

16 (2x)

19

20

27

31

27 and 31 are outliers, two sellers for much cheaper, one of them being 2 months old. Excluding 27 and 31.

14 went to my buy order. Excluding 14.

Going with 16-20.