I think under the circumstance if I read this Right ,he left a deposit as he was going on Holiday he has now returned he has been on here but hasn't arranged to collect them or had the time to speak with you.
I don't think that is good enough if you have mailed him twice, I really don't think he could have any complaints if you just return the deposit stating the reason for the sale is you wanted them out your house and two the money would be handy ,
Waiting a month for a reply isn't fair on you, return the Money with a little note saying unfortunately for what ever reason you haven't been in touch hope you are ok et ,but for the reasons above you do need the room and feel it time to try again and realist them .
Don't be hard on your self this guy isn't being fair ignoring your mail and moving around on here posting or what ever he can obviously contact you but has choosen not to , return the cash and move on