Hi

CROSSCHECK command updates the repository status for a backup to EXPIRED when it cannot locate it at the location to which it was backed up.
This condition could occur if,
for example, a backup was deleted from disk at the operating system level

I suggest you either

Restore the backups from tape to the same loaction where you had backed up the database
and then run crosscheck command again this would make the backups available and you can verify with

list backup of database

Or
if you dont want these backups then you can run the delete expired backups to delete these entries from rman catalog

regards
Hrishy