If the ROM IC itself is MASK ROM it is unlikely to have had a problem but very possible. Thermal expansion/contraction can break joints, corrosion could eat something without it being visible, etc but again unlikely. Though you seem to have beaten the odds here.

If the Woz was involved I'd imagine it conforms to JEDEC spec and you can probably drop an EPROM in place of proper size. Been googling for a few minutes and can't seem to find anything beyond how large the ROMs are in the first place. If anyone needs one written out I can handle it but it sounds like you've already got the hardware for it.