Credit to =[sG]= Professor Pootis for most of the proofs.

Shall we kill the Unusual market again?

Sellers at 12 keys

http://www.tf2outpost.com/trade/24149194

http://www.tf2outpost.com/trade/24149096

Sellers at 12.5 keys

http://www.tf2outpost.com/trade/24148143

http://www.tf2outpost.com/trade/24142237

http://www.tf2outpost.com/trade/24129052

http://www.tf2outpost.com/trade/24141031

http://www.tf2outpost.com/trade/24118866

http://www.tf2outpost.com/trade/24140410

http://www.tf2outpost.com/trade/24145020

http://www.tf2outpost.com/trade/21899213

http://www.tf2outpost.com/trade/22268046

http://www.tf2outpost.com/trade/24136445

http://www.tf2outpost.com/trade/24138822

http://www.tf2outpost.com/trade/24078817

http://www.tf2outpost.com/trade/24114772

http://www.tf2outpost.com/trade/24139899

http://www.tf2outpost.com/trade/13168732

http://www.tf2outpost.com/trade/21899213

http://www.tf2outpost.com/trade/24141031

http://www.tf2outpost.com/trade/23167480

Unsolds at 13 keys

http://www.tf2outpost.com/trade/24114599

http://www.tf2outpost.com/trade/24131610

http://www.tf2outpost.com/trade/24128073

http://www.tf2outpost.com/trade/24116155

http://www.tf2outpost.com/trade/23929210

http://www.tf2outpost.com/trade/24086590

http://www.tf2outpost.com/trade/24134955

http://www.tf2outpost.com/trade/24093028

http://www.tf2outpost.com/trade/24134117

http://www.tf2outpost.com/trade/24111513

http://www.tf2outpost.com/trade/24126418

http://www.tf2outpost.com/trade/24136820

http://www.tf2outpost.com/trade/24136664

http://www.tf2outpost.com/trade/24139022

http://www.tf2outpost.com/trade/24110224

http://www.tf2outpost.com/trade/24087962

http://www.tf2outpost.com/trade/24125146

Buyers

http://www.tf2outpost.com/trade/24140773 - 12.0 keys

http://www.tf2outpost.com/trade/24123892 - 11.0 keys

http://www.tf2outpost.com/trade/24135515 - 12.0 keys

http://www.tf2outpost.com/trade/23919767 - 11.5 keys

http://www.tf2outpost.com/trade/23508947 - 12.5 keys + 1 ref

http://www.tf2outpost.com/trade/16853845 - 12.0 keys

http://www.tf2outpost.com/trade/23975925 - 12.0 keys

http://www.tf2outpost.com/trade/14626321 - 11.0 keys

http://www.tf2outpost.com/trade/23151906 - 12.0 keys

http://www.tf2outpost.com/trade/24140556 - 11.0 keys

http://www.tf2outpost.com/trade/24141133 - 10.0 keys

http://www.tf2outpost.com/trade/24095183 - 12.0 keys

http://www.tf2outpost.com/trade/22781746 - 12.0 keys

http://www.tf2outpost.com/trade/21711674 - 11.0 keys

http://www.tf2outpost.com/trade/22659932 - 12.0 keys

http://www.tf2outpost.com/trade/23973970 - 12.0 keys

http://www.tf2outpost.com/trade/22766875 - 12.0 keys + 1 ref

http://www.tf2outpost.com/trade/24045687 - 12.0 keys

http://www.tf2outpost.com/trade/24132616 - 11.0 keys

http://www.tf2outpost.com/trade/24117712 - 12.0 keys

http://www.tf2outpost.com/trade/23968659 - 12.0 keys

http://www.tf2outpost.com/trade/22282618 - 12.0 keys

http://www.tf2outpost.com/trade/17517467 - 11.0 keys

http://www.tf2outpost.com/trade/18048046 - $26 USD ~ 12.2 keys

http://www.tf2outpost.com/trade/24092674 - 12.0 keys

http://www.tf2outpost.com/trade/24139317 - 11.5 keys

http://www.tf2outpost.com/trade/22983825 - 11.0 keys

http://www.tf2outpost.com/trade/24139021 - 11.0 keys + 7 ref

http://www.tf2outpost.com/trade/15814986 - 11.0 keys + 6 ref

http://www.tf2outpost.com/trade/23962250 - 12.0 keys

http://www.tf2outpost.com/trade/24082073 - 12.0 keys + 5 ref (bot)

http://www.tf2outpost.com/trade/14484778 - 11.0 keys

http://www.tf2outpost.com/trade/24119020 - 12.0 keys

http://www.tf2outpost.com/trade/24140263 - 11.0 keys

Sold for 12 keys

http://www.tf2outpost.com/trade/24148740

Sold for 12.5 keys

http://www.tf2outpost.com/trade/24144898

http://www.tf2outpost.com/trade/24143728

Conclusion: Sales rarely happened, suprisingly. 13 is impossible to sell while there are many 12.5 sellers.

Feel free to counter / support my proofs.