You say the “tapes” but only mention a single tape that was lost.
Was the missing tape actually delivered with the rest?
Was it played and checked in your location?
Who witnessed it being in your location?
If it was, in fact, AT your location, have you looked:
A, In tape boxes of other cassettes that may have been open in the same room at the same time?
B. Call clients who received dubs on the same format tapes as the master?
C. In the sofa cushions in the room?
D. In the restroom?
E. In the coffee area?
F. In the car of the employee
G. In the “other pants, back home” of the employee
There are no limits as to exactly what someone can “claim” in a legal proceeding,
so its useless to speculate what “might” happen, IF it happens.
Wow… this is one of those nightmares we all fear.
Hope you locate the tape.