Find the image you want (with bpimagelist). Then something like:
bpflist -d 01/01/01 -client <client> -backupid <backupid> -rl 9999
While the backupid should uniquely specify the image, bpflist on 6.0 appears to require that you specify a start date and a client as well. (Why? who knows).
A 6.x hot catalog backup should consist of two images. One will be of type 7 (that's the sybase database backup), and one will be type 35 (that's the files, including the image directories).
I don't know exactly what information is and is not stored in the sybase database.
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Darren