Do you mean a 3494 ATL with 3590 tape drives ?
what you can do is
        on ATL perform "full inventory update" which makes the atl scan all
volumes and update its internal db
        you can then (from the attached aix host) do a "mtlib -l/dev/lmcpx
-qI > somefile" to get a list of internal volumes
        then from tsm do a "q vol devc=your3590devc > someotherfile" to get
        then from tsm do a "q vol devc=your3590devc > someotherfile" to get
all the volumes you have
        then from tsm do a "q libvol yourlibrary > somethirdfile"
Now just find the diff of someotherfile & somethirdfile to get the list of
volumes that aren't libvols, then validate that against somefile to make
sure they are actually in the atl THEN just issue checkin libvol xxxxx
checklabel=no status=private devt=3590   for each used volume that isn't a
libvolume but is in the library.
Dwight