1) With just one client or several? - is it possible that someone has manually expired one or two tapes (i.e. those for the 4th-8th)? Do you know which tapes
were used & if so can you check the images on tape?
2) Any other backups visible for 'suspect' client(s)? - if not are you selecting correct policy type in BAR GUI?
NB catalog media is essentially a backup of the database, as such whether it is in the library or not will not affect what you can or can't see (unless you restore your full NetBackup environment from one!) as it is the database you are interrogating initially when restoring images.