The box couldn't even boot on the 5.2.1 boot CD I made, but it did run on the Linux Rescue CD.
Robert copied the raw partitions with dd to another box so we can mount them there. It's copying the /home partition now and should be done mid-afternoon. Haven't yet decided on a plan for what to do after that. I think we'll boot the box in FreeBSD (4.10 system) and see if it can run stable for a couple of hours while we work on copying (from the raw disk image copies) and setting up the lists on another box.