Sale 1:

Sold for 25 keys

http://www.tf2outpost.com/trade/27259035 - B/O of 25

Seller: http://backpack.tf/profiles/76561198001300729#!/compare/1465689600/1466035200

Buyer: http://backpack.tf/profiles/76561198301887776#!/compare/1462320000/1466467200

X = 25

Sale 2:

Quicksold for 19 keys + White Bruiser’s Bandana

http://www.tf2outpost.com/trade/28218892 - B/O of 25

Seller: http://backpack.tf/profiles/76561198301389047#!/compare/1464739200/1464825600

Buyer: http://backpack.tf/profiles/76561198058423925#!/compare/1464739200/1464825600

X = 20

Sale 3:

Sold with ~2.5 keys in items for Haunted Ghosts Base Metal Billycock (21.5)

No outpost

Seller: http://backpack.tf/profiles/76561198058423925#!/compare/1464825600/1464912000

Buyer: http://backpack.tf/profiles/76561197972215762#!/compare/1464825600/1464912000

X + 2.5 = 21.5

X = 19

Sale 4:

Quicksold for 18 keys

http://www.tf2outpost.com/trade/28207024 - B/O of 18

Seller: http://backpack.tf/profiles/76561198009775519#!/compare/1464393600/1464739200

Buyer: http://backpack.tf/profiles/76561198301389047#!/compare/1464652800/1464739200

X = 18

Sale 5:

Sold for 18 keys

http://www.tf2outpost.com/trade/28225036 - B/O of 22

Seller: http://backpack.tf/profiles/76561197972215762#!/compare/1465257600/1465344000

Buyer: http://backpack.tf/profiles/76561198190740542#!/compare/1465257600/1465344000

X = 18

Sale 6:

Sold for 16 keys

http://www.tf2outpost.com/trade/28188648 - B/O of 18

Seller: http://backpack.tf/profiles/76561198184317339#!/compare/1464134400/1464307200

Buyer: http://backpack.tf/profiles/76561197960782432#!/compare/1464220800/1464307200

X = 16

Sellers:

19 keys:

http://puu.sh/q0pyK/0153294032.png - 22 days

Offers:

http://www.tf2outpost.com/trade/28319085 - 6 days

Sales at:

16

18 (2x)

19

20

25

Going to exclude 16, as it seems a bit too low, and outlier-ish

Would normally exclude 25 in cases like this, but it’s a full pure sale. Therefore, keeping it in the range, unless told otherwise.

Going with 18-25