Really pondered this for quite some time as to a good range... see previous suggest http://backpack.tf/suggestion/579e9af28667477a75637c3f#comment-57a0d165866747033b2c1bd1

Sold for 21 Keys

http://backpack.tf/profiles/76561198196807025#!/compare/1464825600/1464912000

Sold for 25 Keys

http://backpack.tf/profiles/76561198102159657#!/compare/1463788800/1463875200

Sold for 21 Keys

http://backpack.tf/profiles/76561198197418265#!/compare/1465776000/1465862400

Sold for like 13 keys in items idk

http://backpack.tf/profiles/76561198213536944#!/compare/1467590400/1467676800

Sold for a Kill-a-Watt Noble Amassment of Hats(26.5 Keys, rounding to 27)

http://backpack.tf/profiles/76561198180701006#!/compare/1468108800/1468195200

Sold for an Australium Black Box(17 Keys) and ~2 Keys in Sweets(19 Keys total, Outlier)

http://backpack.tf/profiles/76561198144836442#!/compare/1468454400/1468540800

My 2 previous sales;

Sold for a Cloud 9 Noble Amassment of Hats(~23.5 Keys) and a Bedouin Bandana(13.5 Keys at the time)(B/O was 34)

http://backpack.tf/profiles/76561198213536944#!/compare/1466035200/1466121600

Sold for an Orbiting Planets Flamboyant Flamenco(~14.5 Keys), a Bubbling Attendant(~13.5 Keys), an Orbiting Fire Handyman's Handle(10 Keys), and ~1 Key in Sweets(~39 Keys total, Outlier)

http://imgur.com/NWET8xg

Quicksold for 20 Keys

http://backpack.tf/profiles/76561198061836787#!/compare/1465948800/1466035200

Credits to pufferfish for the following sale:

Quickbought for 21.5 Keys

http://imgur.com/sMgw7tY

My 3rd sale on these from yesterday (b/o 31) Sold in 4 days (again I quickbought it):

1:1 Ausi scatter w/part = Ausi = http://backpack.tf/item/4765514342 + OF Company = http://backpack.tf/item/653912234

Foamy made me think a bit more, mad <3 buds.

With Current seller @ 28 - http://www.tf2outpost.com/trade/27860054 - I have decided to resuggest that this is the median value, ruling quicksales out, and high outliers and just outside of 2 month old sales out... that leaves the 27 key sale and the 29 key sale. Everything fits nicely then. Whether you include or rule out sales it all averages out to 27.5 or 28 anyways. Letter ride and getter up to date :) Imma gonna keep tryin 2 quickbuy and sell 30+ n e wayz huehue