Sale 1:

Sold for Infernal Smoke Disco Fever (Mini at 28 below) + Pro. KS Aussie Knife (27)

http://www.tf2outpost.com/trade/28595769 - B/O of 90

Seller: http://backpack.tf/profiles/76561198032176942#!/compare/1478563200/1478649600

Buyer: http://backpack.tf/profiles/76561198120312356#!/compare/1478304000/1478649600

X = 55

Sale 2:

Sold for 47 keys in ~4 days

http://www.tf2outpost.com/trade/28633499 - No visible B/O

Seller: http://backpack.tf/profiles/76561198081963512#!/compare/1480291200/1480377600

Buyer: http://backpack.tf/profiles/76561198165808253#!/compare/1480291200/1480377600

X = 47

Sale 3:

Sold for Isotope Field-Tested Corsair Scattergun (38) + 1 key

http://www.tf2outpost.com/trade/28597143 - B/O of 85

Seller: http://backpack.tf/profiles/76561198101100833#!/compare/1479081600/1479168000

Buyer: http://backpack.tf/profiles/76561198021383012#!/compare/1479081600/1479168000

X = 39

Sale 4:

Sold with ~8 keys in items for Blizzardy Storm Thirst Blood

Seller: http://backpack.tf/profiles/76561198175717022#!/compare/1479600000/1479686400

Buyer: http://backpack.tf/profiles/76561198291554347#!/compare/1479600000/1479686400

This sale would bring the Box to about 17 keys. Excluding this sale. Could probably be used to update the Thirst Blood

Sale 5:

Sold for Duped Harvest Moon Triboniophorus Tyrannus (and a kringle collection)

http://www.tf2outpost.com/trade/28620160 - No B/O

Seller: http://backpack.tf/profiles/76561198291554347#!/compare/1479686400/1479772800

Buyer: http://backpack.tf/profiles/76561198074212940#!/compare/1479600000/1479772800

This is quite obviously an outlier too.

Sale 6:

Sold for Hellish Inferno Rancho Relaxo

No outpost

Seller: http://backpack.tf/profiles/76561198033378852#!/compare/1478908800/1478995200

Buyer: http://backpack.tf/profiles/76561198249203506#!/compare/1478908800/1478995200

Might be better to price the Rancho with this sale, due to the lack of B/O here

Sale 7:

Bulk for Infernal Smoke High Five

Seller: http://backpack.tf/profiles/76561198051965437#!/compare/1479945600/1480032000

Buyer: http://backpack.tf/profiles/76561198081963512#!/compare/1479945600/1480032000

Disco Mini:

http://backpack.tf/suggestion/584683ec83de6b21492380bb

Sellers:

50 keys:

http://www.tf2outpost.com/trade/28643362

http://backpack.tf/u/76561198048792033

60 keys:

http://i.imgur.com/TN4wN8N.png

http://www.tf2outpost.com/trade/28613065 - 2 weeks

http://backpack.tf/u/76561198000583758

Offers:

http://www.tf2outpost.com/trade/28612400

http://backpack.tf/u/76561198001812215

Sales at:

39

45

55

Going with 39-55