Sale 1:

Sold for Voltaic Hat Protector Universal Translator (33) + 4 keys + Genuine Killer Exclusive (1)

http://www.tf2outpost.com/trade/28573478 - No B/O

Seller: http://backpack.tf/profiles/76561198096619846#!/compare/1478217600/1478390400

Buyer: http://backpack.tf/profiles/76561198136733593#!/compare/1478217600/1478304000

X = 38

Sale 2:

Sold with Strange Pro. KS Field-Tested Backwoods Boomstick (7) for Green Confetti Le Party Phantom (34)

http://www.tf2outpost.com/trade/28525181 - B/O of 30

Seller: http://backpack.tf/profiles/76561198053700606#!/compare/1475625600/1475712000

Buyer: http://backpack.tf/profiles/76561198125791160#!/compare/1475625600/1475712000

X = 27

Sale 3:

Sold for 26 keys

http://www.tf2outpost.com/trade/28519161 - B/O of 26

Seller: http://backpack.tf/profiles/76561198047683549#!/compare/1476748800/1477958400

Buyer: http://backpack.tf/profiles/76561198173033977#!/compare/1477353600/1477612800

X = 26

Sale 4:

Sold for 26 keys

http://www.tf2outpost.com/trade/28494332 - Deleted B/O

Seller: http://backpack.tf/profiles/76561198088878793#!/compare/1474588800/1474675200

Buyer: http://backpack.tf/profiles/76561198204433501#!/compare/1474502400/1475020800

X = 26

Sale 5:

Sold for Smoking Grimm Hatte (No Mini available) + Aussie Frontier Justice (10)

http://www.tf2outpost.com/trade/28593101 - B/O of 24, was relisted a few times

Seller: http://backpack.tf/profiles/76561198168417778#!/compare/1478563200/1478649600

Buyer: http://backpack.tf/profiles/76561198163792512#!/compare/1478563200/1478649600

Should cap at B/O even without a mini on the Grimm

X = 24 (Capped by B/O)

Sale 6: (dupe)

Sold for 24 keys

http://www.tf2outpost.com/trade/28496839 - B/O of 24

Seller: http://backpack.tf/profiles/76561198083316650#!/compare/1474329600/1474416000

Buyer: http://backpack.tf/profiles/76561198042157068#!/compare/1474329600/1474416000

X = 24

Sale 7:

Sold for Electrostatic Detective Noir

No outpost

Seller: http://backpack.tf/profiles/76561198262713274#!/compare/1478044800/1478131200

Buyer: http://backpack.tf/profiles/76561198170149251#!/compare/1478044800/1478131200

Could be used to update the Noir

Sellers:

27 keys:

http://i.imgur.com/dLx0gdU.png - 9 days

http://backpack.tf/u/76561198156315732

31 keys:

http://www.tf2outpost.com/trade/28595014 - 1 day

http://backpack.tf/u/76561198128971487

Sales at:

24 (2x)

26 (2x)

27

38

38 is an obvious outlier. Excluding 38

Going with 24-27