In reference to your letter of ______________ (date), we have no record of having received the merchandise you returned.
In order to issue you a refund for the $_______, we request that you provide us with the following information:
1. Date you returned the merchandise
2. Form of shipment (Registered, Certified Mail, Padded Jiffy Bag, etc.)
3. Copies of any correspondence to us in regard to returning merchandise
Your cooperation in this matter will enable us to trace the parcel.
Thank you for your help. Please send your correspondence marked to my attention.