We record serial numbers for all our electronic items. For all returned items, we first check the item serial number to make sure we receive the exact item back (we have this process because we have a few cases where few dishonest buyers sent their faulty item back instead of the item we sent). Before we issue the refund we look for any damages (external) and make sure all accessories has been returned (if applicable). Once we are satisfied with the item, we issue a full refund within 24 hrs of receiving the returned item. All false claims will be reported to eBay for further action.