Its perfectly working for the items we can use inside it. You dont even need to lock the chest at all. It is possible to have back those infinite space for the market chest ? Also, I dont think we can sell everything, I tried to find out what is the correct word for birchlog... ! anyways I guess we have to make a lot of chests of the same if we can to sell more.

Correction, I think we have to use the item ID for those that arent working http://www.minecraftinfo.com/IDList.htm

Yeah, the rule of thumb is that if you aren't sure of what the exact name the plugin uses is, then just use the item ID. It should work with all of them, but if there aren't any working right, make sure to contact us.