I didn't see a picture of the back, (maybe you had one and didn't post it) that is where I started having issues with my 52xx, I lost one of the clips on the rear panel cover, then the when I tried a disassembly of the entire unit, the little rear-side-screw-covers just splintered apart as I tried to take them out, then it just disintegrated worse from there. Just to point out, this was kept in a nice climate controlled den, away from sunlight for the entire time that I had it. I wonder if the Japanese/Singapore sourced one that you are getting will have better plastic?, I hope it does - best of luck.
Oh, and although some folks don't appreciate these, I found them to be nice, stable (easily upgraded with networking/memory) all-in-one machines that worked well for archiving floppy images and other similar tasks. They are heavy, so be careful picking it up.