eBay needs to enforce the ruling that the item's physical location is the designated location, and not the address of the drop shipper.

How can eBay possibly know where the items are coming from unless buyers report the seller?  There is the "report" link on each item; people need to report item location misrepresentation and eBay will act if they get number of complaints.  They cannot act on just single report as that could easily be abused by competitors.