If you sent your part back to the return address on the box without an RMA number you received from us, you will not receive credit unless you can provide a valid traceable return tracking number. If you can provide a return tracking number, it can take us weeks to process your return if your return is located. If we cannot locate your return or if you cannot provide a valid return tracking number, credit will not be issued. PLEASE DO NOT SEND RETURNS BACK WITHOUT A VALID RMA NUMBER.