This is one of those ticklish things. I usually don't say much other than to note it as being original and outdated, unless it has an issue of some kind (poorly done to start with, in sorry condition, non-pro meddling / add-ons, etc.). About half of the time I find this stuff on a 2-wire system anyway, and I'm ALWAYS going to recommend rewiring the whole system then. And as always, disclaim to the effect of "can't see and inspect all of it, consult a qualified electrician about concerns, options, estimates, etc." for some basic CYA. Brian G. But That's Just Me