Nobody can be sure that the guy really is Bernd Binder.
You may have the guys address and see that it matches with the true Bernd, but maybe that is just part of the plan of consistency; he hopes that you will see that he is still the same, and then instead of actually using that address, you opt for doing a Bank Transfer, PayPal etc. Any buyers that still want to send money to that address aren't discouraged, it's just that the scammer doesn't recieve that money (He's cutting his loses on that one deal to still ensure the rest will be completed). So, the REAL Bernd Binder is probably looking both confused and happy at a letter he received from CU, throwing money at him!
This is just a posibility.
Maybe it's true
Maybe the scammer is really Binder.
Maybe it's not a scam at all, but a really mistake on the behalf of the post offices.