Sorry to hear you are one of his victims as well. I can assure you many victims can drink Uthes blood by now ! The stories go back up to 30 years ago so you can imagine the amount of damage he has caused ! I think he is now in his late 60-ies.
He not only collects comics but also vintage crime,western, sf, detective fiction, old postcards, dime novels and books in general.
Many people have sued Uthe, often unsuccesful. I know he served jail several times, but it's nothing compared to the damage he has caused.
As stated in the previous messages the internet and especially ebay is a paradise for Uthe. I think we should keep records of all transactions with Uthe: print the winning notification message you get from ebay with Uthes false address, all messages from Uthe, track down Uthes IP address and very important contact ebay safe harbour. Tell them Uthe is active again. They'll respond with their 'case ID message' (always the same auto generated text, not much of a help though). If they have banned Uthe again, print his 'feedback screen' where you can see he is no longer a registered user. If several people do this and Uthe comes back again and again I think there is enough reason to sue ebay and win the case. So print everything related to Uthe. Perhaps US and European victims of Uthe can unite and file a complaint. Single complaints are chanceless. I think I can find a German lawyer willing to help us, but first need sufficient evidence.
OK, now to how to recognise Uthe.
1. ask yourself the question: how many Germans are interested in vintage US comics ? I can count them one one hand.
2. when Uthe registers under a false name he first builds up his reputation by bidding (and even paying) for some cheap items. After a few positive feedbacks he starts selling. Avoid all German sellers with less than 100 positive feedbacks, 99% chance it's Uthe.
3. Look at the letter-type he is using: often bold and large.
4. look at the scans. Most of his backgrounds are black.
His current ebay names are (100% sure): yarecity, mitternachtsloewe
Suspected is: amar 1872
It's only the tip of the iceberg..............