Counterfeit item received after opening not received case

[crazyelflin]

I opened a not recieved case. The item has now arrived but it is counterfiet. The seller has agreed to refund if I return the item. Should I close the not recieved case ? Will this then allow me to open a return case ? I want to do the return through ebay so that I can ensure that I get my refiund. 

Thanks

[plpmr]

do as m25jet advises and ask eBay to change the case to a not as described one.