I had sent in my drone to DJI to repair a motor. At the time my unit was covered under the warranty. I had some issues with the timeliness of the repair, but I wasn't too concerned as I borrowed my dad's UAS in the meantime (and he has no desire to have it back). So once I had received my original UAS back, it remained in the box for a while. Well I recently took it out and noticed some differences. I assumed it was due to the repairs that were completed and didn't think anything much. But today I was updating my flight log and decided to check the S/N and to my surprise I didn't receive my UAS back. I have sent DJI and email and am awaiting their response. I keep records of my flights and maintenance, and now I have a unit that may have had a previous life. I guess I am looking for any advice or ideas on how to handle this issue. Or would like to know if others have had similar issues.