Set a due date for payment and pickup for this guy and let him know that if they are not paid for and picked up by that date that you will re-list them.

Always put payment terms and pickup terms on the ad so you can state that to buyers and they can not say they did not know.

I had a guy take 2 months to pick up someting he had already paid for. I had to keep calling him and sending messages. Not worth it. Now I always stae that the goods muct be picked up in 2 weeks or whatever.