A question about a recent trade.

Hey,  I made a trade recently, and he sent his cards first, once I received them I sent mine to him as we agreed on. The day  I sent them though was the last day he logged on. And I used delivery confirmation to show that the cards arrived, and that they (usps) have left him a note for him to pick them up. The problem I'm having is that on the site it shows that I have received my cards, and that he is still waiting on mine. What can I do about this? I don't want this to hinder further trades I have on this site. And how long will it stay up? I want it known I don't have a problem with the other trader he could have some personal problems and not be able to make it onto the site. But again I don't want this just hanging over my account forever either.