Makes sense too - people have been rushing to craft the new demoman stuff using the class / slot tokens.

Some of these trades are weeks/months old, too old to use

Just a look at some of the top solds:

http://www.tf2outpost.com/trade/23153801 (2+ months old)

http://www.tf2outpost.com/trade/23551637 (1+ month old)

http://www.tf2outpost.com/trade/23164074 (2+ months old)

http://www.tf2outpost.com/trade/23164144 (2+ months old)

http://www.tf2outpost.com/trade/23636339 (1+ month old)

These sales are really, REALLY old and shouldn't be used, especially for weapons which are bought and sold pretty quickly. "Old" trades are considered anything older than 1-2 weeks old (correct me if I'm wrong), so you should probably consider adding recent evidence.