Sale 1:

Sold for Strange Spec. KS Kritzkrieg (11) + Spec. KS C.A.P.P.E.R. (2) + Pro. KS Aussie Blutsauger (10)

http://www.tf2outpost.com/trade/28565438 - No B/O

Seller: http://backpack.tf/profiles/76561197987183850#!/compare/1477440000/1477526400

Buyer: http://backpack.tf/profiles/76561198160337844#!/compare/1477353600/1477526400

X = 23

Sale 2:

Sold for Smoking Anger (Mini at 25 below)

http://www.tf2outpost.com/trade/28560480 - B/O of 23, Seller confirms sale (legend)

Seller: http://backpack.tf/profiles/76561198096389539#!/compare/1478131200/1478217600

Buyer: http://backpack.tf/profiles/76561198157702949#!/compare/1477958400/1478217600

X = 23 (Capped by B/O)

Sale 3:

Sold for Blizzardy Le Party Phantom (Mini at 26 below)

http://www.tf2outpost.com/trade/28577594 - B/O of 23

Seller: http://backpack.tf/profiles/76561198031007256#!/compare/1478044800/1478131200

Buyer: http://backpack.tf/profiles/76561198064788088#!/compare/1478044800/1478131200

X = 23 (Capped by B/O)

Sale 4:

Sold for Unusual Field-Tested Masked Mender (Unpriced) + ~7 keys in items

http://www.tf2outpost.com/trade/28548200 - B/O of 22

Seller: http://backpack.tf/profiles/76561198236007746#!/compare/1477094400/1477267200

Buyer: http://backpack.tf/profiles/76561198097848712#!/compare/1477267200/1477353600

Should easily cap at the B/O, there is a medi-gun buyer for 27 keys:

http://i.imgur.com/TvtI1NM.png

X = 22 (Capped by B/O)

Sale 5:

Quicksold for Max’s (23 at the time)

http://www.tf2outpost.com/trade/28542245 - B/O of 22

Seller: http://backpack.tf/profiles/76561198132264411#!/compare/1476403200/1476489600

Buyer: http://backpack.tf/profiles/76561198110677513#!/compare/1476403200/1476489600

X = 22 (capped by B/O)

Sale 6:

Sold for Green Confetti Brigade Helm (Mini at 15 below) + Strange All-Father (5 at the time) + Buds (2)

http://www.tf2outpost.com/trade/28572715 - B/O of 23

Seller: http://backpack.tf/profiles/76561198071103112#!/compare/1477699200/1477785600

Buyer: http://backpack.tf/profiles/76561198011448525#!/compare/1477699200/1477785600

X = 22

Might even end up capping at 23, the mini on the Brigade was based off of a quicksale.

Sale 7:

Sold in less than a day for Blizzardy Private Eye (19)

No outpost

Seller: http://backpack.tf/profiles/76561198262820010#!/compare/1476403200/1476489600

Buyer: http://backpack.tf/profiles/76561198132264411#!/compare/1476403200/1476489600

X = 19

Sale 8:

Sold for Searing Boron Beanie + Buildings Destroyed Part

No outpost

Seller: http://backpack.tf/profiles/76561198147063581#!/compare/1479772800/1479859200

Buyer: http://backpack.tf/profiles/76561198088822281#!/compare/1479686400/1479772800

Might be better to update the Beanie with this sale, seeing as there is not B/O here.

Sale 9:

Bulk for Arcana Larrikin Robin

Seller: http://backpack.tf/profiles/76561198055774847#!/compare/1476921600/1477008000

Buyer: http://backpack.tf/profiles/76561198096389539#!/compare/1476921600/1477008000

Smoking Anger Mini:

Sold for 25 keys

http://www.tf2outpost.com/trade/28594494 - B/O of 25, seller confirms sale (legend)

Seller: http://backpack.tf/profiles/76561198096389539#!/compare/1479340800/1479427200

Buyer: http://backpack.tf/profiles/76561198066331482#!/compare/1479340800/1479427200

X = 25

Blizzardy Storm Phantom Mini:

Sold for 26 keys

http://www.tf2outpost.com/trade/28606311 - B/O of 26

Seller: http://backpack.tf/profiles/76561198067622687#!/compare/1478995200/1479081600

Buyer: http://backpack.tf/profiles/76561198150997435#!/compare/1479081600/1479254400

X = 26

Green Confetti Brigade Helm Mini:

Quicksold for 15 keys

http://www.tf2outpost.com/trade/28601442 - B/O of 15

Seller: http://backpack.tf/profiles/76561198104646282#!/compare/1477612800/1477699200

Buyer: http://backpack.tf/profiles/76561198145823187#!/compare/1477440000/1477699200

X = 15

Sellers:

22 keys:

http://i.imgur.com/y2kX5Pw.png

http://backpack.tf/u/76561198088822281

Sales at:

19

22 (3x)

23 (3x)

19 sold in less than a day, and is a bit of an outlier. Excluding 19

Going with 22-23