RMAN - Removing 'non-existant' archived logs

(Version 11.1)

I'm just in the process of setting up rman for a machine.
Somehow I have a situation where when I do a "crosscheck archivelog all" I get told about a whole bunch of failures for non-existant log files - e.g. 

validation failed for archived log
archived log file name=/database1/oracle-archive/arch. 0676670550.0001.0000000503.dbf RECID=678 STAMP=692965495
What do I do to clean up these messages without deleting genuine log files? 

Thanks,

Steve

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