Buyer opens a not as described case, you supply a return label and on return you refund in full.
No returns only refers to change of mind returns, if buyer claims faulty, then it is up to you to supply return label, then no return, no refund.
Return is up to you, if case is opened and you do nothing, buyer escalates to ebay, who refund, assuming you do not want camera returned.
You need to read the 30 day money back guarantee.