I have the vector image files for the cab/headbox art if you need them for when you find a beater and want to try a redecal.

Most machines should be in fairly good condition I would have thought? Apart from some cabinet fade and some flipper button wear.

I know the first run of machines has the standard siderails - most of them have severe wear around the flipper buttons. In subsequent runs, Stern swapped over to lollipop style siderails which was a marked improvement for artwork durability.

EDIT:
My machine is a Euro first run which has had lollipop siderails added later - I just checked and the artwork underneath the siderail is obliterated.  

Good luck with the search.