Please check Oracle Support id : RMAN-6026 RMAN-6023 when restoring to new host (Doc ID 1300586.1)
Putting the backup copy in a different location on the new host will cause RMAN to mark the backups as EXPIRED.
And please check below OTN Form:
Use Catalog backuppiece like as
RMAN> catalog start with 'Path_where_backup_peieces_located';
If above command not able to find the backup pieces then use to as below
RMAN> catalog backuppiece ' Complete path with backup piece name'; ----------------> Run for each backup piece