It is nice, that veaam stores all information about tapes in his database.
It is not that nice, that information about a tape is not stored directly on the tape.
B&R should write header information to every new tape, which was identified.
Header should be written by admin request or on next time seen online.
Header should include:
Tape protection mark with timestamp/serial. if this tape is pushed into another veeam instance which does not know this tape, then it should see - tape is protected and obey this without knowing it before
Media Pool identifier - If not in database veeam should be able to read this metadata from tape
Anyway the properties of tapes need to be enhanced.
You have to see a unique media id and be able to make a better management of a tape. so you should be able to store in database+metadata the first use oft the tape.
and the access history