Sale 1:

Sold for Pro. KS Aussie Sniper (30) + Spec. KS Aussie SMG? (7)

No outpost

Seller: http://backpack.tf/profiles/76561198079764636#!/compare/1491782400/1491868800

Buyer: http://backpack.tf/profiles/76561198056815516#!/compare/1491523200/1495670400

X = 37

Sale 2:

Sold for Haunted Ghosts Bonk Helm (27) + 2 keys + ~1 key in metal/items

http://www.tf2outpost.com/trade/28907540 - No B/O

Seller: http://backpack.tf/profiles/76561198053252981#!/compare/1494201600/1494288000

Buyer: http://backpack.tf/profiles/76561198203014440#!/compare/1494201600/1494288000

X = 30

Sale 3:

Sold for 29 keys in ~4 days (buyer’s compare link)

http://www.tf2outpost.com/trade/28894027 - B/O of 29, seller confirms sale (legend)

Seller: http://backpack.tf/profiles/76561198024925599#!/compare/1493251200/1493337600

Buyer: http://backpack.tf/profiles/76561198115458307#!/compare/1493337600/1493424000

X = 29

Sale 4:

Sold with 3 keys for Disco Beat Down Your Worst Nightmare (31)

http://www.tf2outpost.com/trade/28815508 - Deleted B/O

http://webcache.googleusercontent.com/search?q=cache:_XDRwe2e8FkJ:www.tf2outpost.com/trade/28815508+&cd=1&hl=en&ct=clnk&gl=au – B/O of 31, before deleting.

Seller: http://backpack.tf/profiles/76561198080786736#!/compare/1492041600/1492214400

Buyer: http://backpack.tf/profiles/76561198039005753#!/compare/1491955200/1492041600

X = 28

Sale 5:

Sold for Vivid Large Luchadore (31.5)

http://www.tf2outpost.com/trade/28855122 - B/O of 28

Seller: http://backpack.tf/profiles/76561198073292814#!/compare/1491782400/1491868800

Buyer: http://backpack.tf/profiles/76561198079764636#!/compare/1491782400/1491868800

X = 28 (Capped by B/O)

Sale 6:

Sold for ~26 keys worth of items (4 items total)

Seller doesn’t list B/Os on outpost, no point checking there.

Seller: http://backpack.tf/profiles/76561198011321852#!/compare/1489708800/1489795200

Buyer: http://backpack.tf/profiles/76561198228991628#!/compare/1489708800/1489795200

X = 26

Sale 7:

Sold for Stormy Tyrant’s (26)

No outpost

Seller: http://backpack.tf/profiles/76561198293226964#!/compare/1494374400/1494633600

Buyer: http://backpack.tf/profiles/76561198267189538#!/compare/1494547200/1494633600

X = 26

Sale 8:

Sold for 26 keys in ~2-3 days

http://www.tf2outpost.com/trade/28874965 - B/O of 28

Seller: http://backpack.tf/profiles/76561198132046444#!/compare/1492128000/1492214400

Buyer: http://backpack.tf/profiles/76561198286561714#!/compare/1492128000/1492214400

X = 26

Sale 9:

Quicksold for 22 keys

No outpost

Seller: http://backpack.tf/profiles/76561198095022965#!/compare/1496620800/1496707200

Buyer: http://backpack.tf/profiles/76561198096857243#!/compare/1496620800/1496707200

X = 22

Sale 10:

Bulk for Scorching Surgeon’s Shako

Seller: http://backpack.tf/profiles/76561198045466865#!/compare/1492300800/1492387200

Buyer: http://backpack.tf/profiles/76561197998161567#!/compare/1492300800/1492387200

Sale 11:

Bulk for Burning Woolen

Seller: http://backpack.tf/profiles/76561197998161567#!/compare/1492560000/1492905600

Buyer: http://backpack.tf/profiles/76561198086605050#!/compare/1492819200/1492905600

Sale 12:

Bulk for Ghosts Mancer

Seller: http://backpack.tf/profiles/76561198079404789#!/compare/1490313600/1490400000

Buyer: http://backpack.tf/profiles/76561198073292814#!/compare/1490313600/1490486400

Sale 13:

Bulk for Miami Nights Brainiac

Seller: http://backpack.tf/profiles/76561198147094422#!/compare/1490227200/1490313600

Buyer: http://backpack.tf/profiles/76561198090956917#!/compare/1490227200/1490313600

Sale 14:

Bulk for Searing Hong Kong Cone and 4 keys

Seller: http://backpack.tf/profiles/76561198228991628#!/compare/1491782400/1491955200

Buyer: http://backpack.tf/profiles/76561198132046444#!/compare/1491955200/1492041600

Sale 15:

Bulk for Beams Stash

Seller: http://backpack.tf/profiles/76561198013245606#!/compare/1492905600/1492992000

Buyer: http://backpack.tf/profiles/76561198024925599#!/compare/1492905600/1492992000

Sale 16:

Bulk for Nether Trail Prehistoric Pullover

Seller: http://backpack.tf/profiles/76561198115458307#!/compare/1493683200/1493769600

Buyer: http://backpack.tf/profiles/76561198053252981#!/compare/1493683200/1493769600

Sale 17:

Bulk for Burning HKC

Seller: http://backpack.tf/profiles/76561198267189538#!/compare/1496620800/1496707200

Buyer: http://backpack.tf/profiles/76561198132066578#!/compare/1496102400/1496707200

Sellers:

30 keys:

http://i.imgur.com/jWokeKd.png - 4 months

http://backpack.tf/u/76561198107520045

http://www.tf2outpost.com/trade/29181346

http://i.imgur.com/PfnQgbs.png - 7 months

http://backpack.tf/u/76561198006544512

http://www.tf2outpost.com/trade/28832919

http://i.imgur.com/FJoa85z.png - 24 days

http://backpack.tf/u/76561198090956917

http://i.imgur.com/e6Nqa0M.png

http://backpack.tf/u/76561198012055413

http://www.tf2outpost.com/trade/28677340 - 5 months, listed for 31 here

http://i.imgur.com/E2y9faB.png

http://backpack.tf/u/76561198039005753

http://www.tf2outpost.com/trade/28877325 - 1 month

32 keys:

http://i.imgur.com/ILWUJvH.png - 6 months

http://backpack.tf/u/76561198021272428

http://www.tf2outpost.com/trade/29216579

Sales at:

22

26 (3x)

28 (2x)

29

30

37

22 quicksold, excluding 22.

Assuming the sale at 37 is correct (which I highly doubt), it would be a large outlier. Excluding 37.

Sellers several months old at 30, and the sale at 30 isn’t pure. Excluding 30.

Going with 26-29.