When you report it to the Police,and you most certainly should, make sure you receive a crime reference number, otherwise they will just ignore it and carry on with something more important. Like spying on the victims of crime, for instance.
Keep trying with ebay. If they still don't do anything, try this :::
http://www.consumeractiongroup.co.uk/forum/showthread.php?197332-Making-a-complaint-against-ebay
Put the buyer on the site, then everybody else will know. I have never had any problems with ebay, but it would seem that it is best advice to look at the buyer feedbacks before posting. Not your fault of course...ebay need to wake up to this sort of thing.