I do not think that receipts will be any good afterall anybody could copy your receipt image and use it themselves, no, too easily forged, copied or fabricated.
The selling of such goods is becoming extremely difficult thanks to all the crooked sellers ruining it for the likes of you.
You need to find out from ebay exactly what the problem is and whether the next listing you are going to put up is safe.
I think that if they suspend you a second time it will be for a lot longer and greedbay is extremely zealous at present to make things look safe and keep the manufacturers of such goods happy regardless of losing a few sellers.
Afterall they stand very little chance of being taken to court by an average seller but a big chance with a major brand owner.