How are you sending the NAS to your friend? Strongly advise to avoid posting it, but either way, put as much vibration padding as you can. Harddisks can be affected/damaged by vibration and shocks, so you want to keep them as protected as possible.
Data Hoarder
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Where find the 923+?
I got it on amazon
Yes, but make sure it's super well-padded and that all the drives are securely locked.
If the drives are mounted firmly then it should be fine with proper outside packaging.