Unfortunately the linux version doesn't seem to have either blkid or file, it is a really cut down embedded version I think.
However when I use mount I get the info :-
/dev/hdc2 on /mnt/ide3 type ext2 (rw,loop=/dev/loop1,encryption=AES128)
Guessing here but I assumed that meant the device /dev/loop1 is a unencrypted version of /dev/hdc2.
My hope is that a dd of loop1 to a spare drive (which i am currently running now) will result in an unencrypted unmounted version of the raw partition.
I am admittedly way out of my depth here