Well for someone who supposedly is able to identify shill bidding, one would expect them to be able to figure out how to contact a real live person at ebay.

In addition, you state you suspect shill bidding.  guess what  ebay will not act on your mere suspicion, so you had better be 100% damn sure of your accusations before contacting ebay.

As for  there being no evidence after the sale is complete, what a load of rubbish,  any mere mug can still access the sale and all bidding records.