Sale 1:

Sold for Terror-Watt Dead Cone (17) + Logo Football Helmet (Mini at 13 below)

http://www.tf2outpost.com/trade/28774152 - B/O of 30

Seller: http://backpack.tf/profiles/76561198114635132#!/compare/1486684800/1486771200

Buyer: http://backpack.tf/profiles/76561198193710729#!/compare/1486771200/1486857600

X = 30

Sale 2:

Sold for Smoking Le Party Phantom (Mini at 21.5 below) + 5 keys

No outpost

Seller: http://backpack.tf/profiles/76561198057740823#!/compare/1485734400/1485820800

Buyer: http://backpack.tf/profiles/76561198097968479#!/compare/1485561600/1485820800

X = 27

Sale 3: (Dupe)

Sold for 23 keys

http://www.tf2outpost.com/trade/28699355 - B/O of 23

Seller: http://backpack.tf/profiles/76561198150783829#!/compare/1483574400/1483660800

Buyer: http://backpack.tf/profiles/76561198297852347#!/compare/1483660800/1483747200

X = 23

Sale 4:

Sold for 20 keys

http://www.tf2outpost.com/trade/28604456 - B/O of 28

Seller: http://backpack.tf/profiles/76561198120536897#!/compare/1485648000/1485734400

Buyer: http://backpack.tf/profiles/76561198057740823#!/compare/1485648000/1485734400

X = 20

Sale 5:

Sold for Max’s Head (19)

No outpost

Seller: http://backpack.tf/profiles/76561198204285311#!/compare/1481241600/1481328000

Buyer: http://backpack.tf/profiles/76561198076020691#!/compare/1481241600/1481328000

X = 19

Sale 6:

Sold with 4 keys for Logo Electric Escorter + Green Confetti Heavy Duty Rag

Seller: http://backpack.tf/profiles/76561198152095101#!/compare/1485388800/1485475200

Buyer: http://backpack.tf/profiles/76561198131014883#!/compare/1485388800/1485475200

This sale will end up being around 20 keys

Sale 7:

Sold with 4 keys + ~1 key in metal for Morning Glory Copper’s Hard Topper

Seller: http://backpack.tf/profiles/76561198131014883#!/compare/1485648000/1485734400

Buyer: http://backpack.tf/profiles/76561198182213262#!/compare/1485648000/1485734400

Would be better to update the Copper’s with this sale.

Sale 8:

Bulk for Showstopper Burstchester

Seller: http://backpack.tf/profiles/76561198182213262#!/compare/1485734400/1485820800

Buyer: http://backpack.tf/profiles/76561198077598622#!/compare/1485734400/1485820800

Sale 9:

Bulk for Miami Nights Tough Stuff Muffs

Seller: http://backpack.tf/profiles/76561198097968479#!/compare/1485907200/1485993600

Buyer: http://backpack.tf/profiles/76561198066195760#!/compare/1485907200/1488412800

Muffs are in-date, but this sale is a bit too bulky to be used.

Logo Football Helm Mini:

Sold for Green Confetti Tam O’ Shanter (Mini at 13 below)

http://www.tf2outpost.com/trade/28793337 - B/O of 11.3

Seller: http://backpack.tf/profiles/76561198134879971#!/compare/1487635200/1487721600

Buyer: http://backpack.tf/profiles/76561198095589372#!/compare/1487721600/1487808000

Ignoring the B/O due to how quickly it sold

X = 13

Green Confetti Tam Mini:

Sold for 12 keys + ~1 key in items

http://www.tf2outpost.com/trade/28190382 - B/O of 15

Seller: http://backpack.tf/profiles/76561198026129220#!/compare/1483660800/1483747200

Buyer: http://backpack.tf/profiles/76561198111805265#!/compare/1483660800/1483747200

X = 13

Smoking Le Party Phantom Mini:

http://backpack.tf/suggestion/58bbe650c4404537281b259e

Sellers:

28 keys:

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

http://backpack.tf/u/76561198076122930

29 keys:

http://i.imgur.com/n1y4uZq.png - 19 days

http://backpack.tf/u/76561198076020691

http://www.tf2outpost.com/trade/28806463

30 keys:

http://i.imgur.com/1YDIwHx.png - 2 months

http://backpack.tf/u/76561198090956917

33 keys:

http://i.imgur.com/4C1rMui.png - 1 day

http://backpack.tf/u/76561198066195760

Sales at:

19

20

23 (Dupe)

27

30

19 and 20 are most likely outliers, seeing as there is a dupe sale at 23 pure.

Going with 27-30.