Sale 1:

Sold for Darkblaze FR-0 (29.5)

http://www.tf2outpost.com/trade/28661647 - B/O of 28

Seller: http://backpack.tf/profiles/76561198064423172#!/compare/1482105600/1482192000

Buyer: http://backpack.tf/profiles/76561198137796415#!/compare/1482019200/1482192000

X = 28 (Capped by B/O)

Sale 2:

Sold for 26 keys

http://www.tf2outpost.com/trade/28798012 - B/O of 26

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

Buyer: http://backpack.tf/profiles/76561198200090441#!/compare/1488153600/1488326400

http://imgur.com/a/Kwfmb

X = 26

Sale 3:

Sold with a key for Spectral Swirl Bad Pipes (25)

No outpost

Seller: http://backpack.tf/profiles/76561198277946046#!/compare/1482192000/1482278400

Buyer: http://backpack.tf/profiles/76561198164512379#!/compare/1482192000/1482278400

X = 24

Sale 4:

Sold for Cloud 9 Modest Metal Pile of Scrap

http://www.tf2outpost.com/trade/28664558 - No B/O

Seller: http://backpack.tf/profiles/76561198002186909#!/compare/1482105600/1482192000

Buyer: http://backpack.tf/profiles/76561198144280236#!/compare/1482105600/1482192000

May be better to update the Scrap with this sale, considering the 2 month old seller at 30 keys, and the lack of B/O here. (If this exceeds 26 keys, it’ll probably be excluded here anyways)

Sale 5:

Sold for Sunbeams Bootleg Base Metal Billycock

No outpost

Seller: http://backpack.tf/profiles/76561198137796415#!/compare/1482019200/1482192000

Buyer: http://backpack.tf/profiles/76561198277946046#!/compare/1482105600/1482192000

The Billycock looks insanely low, and due to the lack of B/O here, it’ll probably be better to update the Billycock with this sale instead.

Sale 6:

Sold with ~6 keys in items for Stormy Texas Ten Gallon

Seller: http://backpack.tf/profiles/76561198144280236#!/compare/1482105600/1482192000

Buyer: http://backpack.tf/profiles/76561198021055079#!/compare/1482105600/1482192000

Should be used on the Ten Gallon

Sale 7:

Bulk for Green Energy Larrikin

Seller: http://backpack.tf/profiles/76561198260119454#!/compare/1480982400/1481241600

Buyer: http://backpack.tf/profiles/76561198064423172#!/compare/1481155200/1481241600

Should be used on the Larrikin.

Sale 8:

Sold with ~15 keys in items for Searing Plasma Festive Tree (29)

Seller: http://backpack.tf/profiles/76561198162463523#!/compare/1481328000/1481414400

Buyer: http://backpack.tf/profiles/76561198245543900#!/compare/1481328000/1481414400

Too bulky to be used here.

Sale 9:

Sold for Infernal Flames Shred Alert + Strange Pro. KS Brass Beast

Seller: http://backpack.tf/profiles/76561198291554347#!/compare/1482710400/1482796800

Buyer: http://backpack.tf/profiles/76561198094507802#!/compare/1482710400/1482796800

This’ll end up being way too high.

Sellers:

26 keys:

http://i.imgur.com/bT0FwrE.png - 2x 28 days, both look to have been lowered in price over the course of 3 months (at least)

http://backpack.tf/u/76561198125791160

http://i.imgur.com/Fq7IRVL.png - 1 month

http://backpack.tf/u/76561198053928031

http://www.tf2outpost.com/trade/28741028

http://i.imgur.com/Nm4j1Hu.png - 15 days

http://backpack.tf/u/76561198054758757

38 keys:

http://i.imgur.com/XpiKNOd.png - 3 months

http://backpack.tf/u/76561198004517334

Offers:

http://www.tf2outpost.com/trade/28628717 - 3 months, strange

http://backpack.tf/u/76561198068062087

http://www.tf2outpost.com/trade/28606259 - 3 months, strange

http://backpack.tf/u/76561198088305642

Sales at:

24

26

28

Multiple aged sellers at 26 would prove sales above 26 to be outliers. Excluding 28.

Going with 24-26.

Not too sure if excluding 28 is the right choice here, as the sale at 26 was a pure sale, and creating a range of 24-28 would give an average of 26, which best represents the pure sale. However, the sale at 28 is quite old (20th December).