Well...

Proof:

Classifieds at the time: http://gyazo.com/640397027b2de9e05b5a6a6fd8302880 x1 16 ref, x4 1 key.

The 16 ref one sold ^

Buyers: x1 1.06 keys (1 key 1 ref) x1 1 key

Sellers:

http://www.tf2outpost.com/trade/26431683 (3 keys)

http://www.tf2outpost.com/trade/26427823 (40 ref)

http://www.tf2outpost.com/trade/26442195 (1 key)

http://www.tf2outpost.com/trade/26442917 (1 key)

http://www.tf2outpost.com/trade/26443285 (1 key + 3 ref)

http://www.tf2outpost.com/trade/26443737 (2 keys)

http://www.tf2outpost.com/trade/26443716 (adding a ref for a key)

http://www.tf2outpost.com/trade/26440882 (2 keys)

http://www.tf2outpost.com/trade/26422253 (2 keyS)

http://www.tf2outpost.com/trade/26443664 (3 keyS)

http://www.tf2outpost.com/trade/26443592 (22.5 ref?)

http://www.tf2outpost.com/trade/26443340 (1 key)

http://www.tf2outpost.com/trade/26413051 (2 keys)

http://www.tf2outpost.com/trade/26443478 (1 key 7 ref)

http://www.tf2outpost.com/trade/26443444 (1 key)

http://www.tf2outpost.com/trade/26440986 (1 key 6 ref)

http://www.tf2outpost.com/trade/26441093 (1 key with an offer of 1 key?)

http://www.tf2outpost.com/trade/26441811 (1 key 7 ref)

http://www.tf2outpost.com/trade/26443200 (2 keys)

http://www.tf2outpost.com/trade/26443138 (1 key 2 ref)

http://www.tf2outpost.com/trade/26443055 (2 keys)

http://www.tf2outpost.com/trade/26442966 (2 keys)

http://www.tf2outpost.com/trade/26436787 (2 keys)

http://www.tf2outpost.com/trade/26442834 (1 key 5 ref)

http://www.tf2outpost.com/trade/26440913 (1 key 10 ref)

http://www.tf2outpost.com/trade/26442744 (1 key)

http://www.tf2outpost.com/trade/26440863 (29 ref)

Solds:

http://www.tf2outpost.com/trade/26442200 (sold for a key, which he then later used to buy the side thing he wanted before)

http://www.tf2outpost.com/trade/26441384 (sold for a key)

http://www.tf2outpost.com/trade/26410838 (... um.. sold for idk? But the bot might have fixed prices? The one in the trade didnt sell but sold another one, also had an offer of 1 key 9 ref in comments?)

http://www.tf2outpost.com/trade/26427731 (ending up only selling for a key)

http://www.tf2outpost.com/trade/26442519 (was selling for 18 ref, not sure what it sold for tho, might of sold on scm?)

Buyers (on op):

http://www.tf2outpost.com/trade/26410311 (closed but was buying for a key)

http://www.tf2outpost.com/trade/26367192 (10 ref)

http://www.tf2outpost.com/trade/26442508 (7 ref)

http://www.tf2outpost.com/trade/26410354 (14 ref)

http://www.tf2outpost.com/trade/26391064 (0.5 keys)

http://www.tf2outpost.com/trade/26441798 (10 ref)

http://www.tf2outpost.com/trade/26434024 (10 ref)

http://www.tf2outpost.com/trade/26409493 (12 ref)

http://www.tf2outpost.com/trade/26443827 (14 ref)

http://www.tf2outpost.com/trade/26438235 (10 ref)

http://www.tf2outpost.com/trade/26399574 (1 key) ~~~

http://www.tf2outpost.com/trade/26442502 (2 cases for 1 key)

http://www.tf2outpost.com/trade/26442407 (16 ref) ~~~

http://www.tf2outpost.com/trade/26442943 (1 csgo key)

http://www.tf2outpost.com/trade/26349961 (1 key)

http://www.tf2outpost.com/trade/26428733 (10 ref)

http://www.tf2outpost.com/trade/26431610 (used to be paying 1 key 3 ref, now paying 14 ref)

http://www.tf2outpost.com/trade/26436916 (1 key)

http://www.tf2outpost.com/trade/26430165 (11 ref)