Roy,

I hesitate to answer your question,
because it would support you in a VERY BAD practise.

I find operation with only single copy of data simply irresponsible.

The costs for second copy are very low - only couple of tape media.

Do rethink this design, consider creating backup pool.
This makes it possible to keep tapes from primary pool
unloaded from library but still on-site,
thus eliminating your find-correct-tape problem.

regards
Juraj Salak