...
Since you indicated the files were opened (and not closed) 
by a BAL subroutine, the COBOL code may not even be aware of it.
...

My Mother used to say:

You use it; you clean it.
Put it back where you got it from.
Always wear clean underwear, in case you get hit by a bus.

The point is:
A programme, sub-routine, etc. that opens a file should (must) close it.

You can't leave artifacts around for callers to trip over.

(At least, that's what I was taught at the UoW in the 1970's)

-teD
(The secret to success is sincerity.
If you can fake that,
you've got it made!)

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