Well, the issues I had with airey is that I purchased an amiga 500 for my niece. It was sent to her address and so it was some months before I could inspect the amiga, upon a visit.
The a520 tv adapter was not included, though advertised and the amiga had 3 large cracks in the casing.
Basically it was %&$#?@!%&$#?@!%&$#?@!%&$#?@!e and a waste of money.
I'm just going to throw this out there as a hypothetical. Based on your statement that "it was months before you could inspect the Amiga", is it possible that the A520 was misplaced and cracks occurred after he shipped it, but before you had a chance to inspect it?