Does anyone have any idea what was used for the key or have better screencaps?

The case just looks like a normal DAT tape case for a computer backup drive.
I thought the same thing except that all of the DAT cases I have and remember using in the past were rectangular. The only square ones I had were from optical discs and were much thinner.
Mini DVD (8cm disc) case?
Whoa! Where would we go about finding one of these?
I may have found it
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backup tape (LTO) case
I think you'r right even the key itself looks like a LTO tape.
I think you'r right even the key itself looks like a LTO tape.