Trade Gone Bad

I accepted a trade that was offering 400 wheat for 400 copper. The copper was removed from my storehouse, but I never received the wheat. Tried re-logging in hoping that it was just a graphical display error but still no wheat. :(

EDIT: Later today I received a mail saying he had refused the trade (although he had initiated it). Attached to the mail was my 400 copper. I'm glad that it wasn't immediately returned (the copper) because it would have overflowed. I had time to trade down my current copper to make room. Kudos..