Were the files actually from the 17th or the 15th?

Tom Jones wrote:

I had to restore a folder for a user on our email server.
I ran recover at the Unix command line, changetime to 01/17
and found the desired files.  I mounted the tape for
01/17 (Wed.001) but the requested volume was Monday's
tape (Mon.001).  I mounted Mon.001 and successfully
restored the files.

I'm looking for a reason for the files found in recover
with a date of 01/17 and a volume that was written on
01/15.  We perform full backups each night.

Do I need to rebuild indexes or perform any other
maintenance?

Thanks
Tom Jones

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