If someone bought on 2 July and has not paid by now, I don't like your chances that they are going to.

Their perfect record you speak of is probably the feedback score & if they have only been a buyer , then they can only be given a positive rating by a seller. Buyers can give a neg to a seller but not vice versa.

In any case, just wait it out and as soon as you can (probably around 10 July?) file an ebay unpaid item claim as at least then you'll get most of your fees back.