If by "interconnects" he means the jumpers between Pre-out and Main-in, those in the pics are NOT original. They're some kind of generic after-market ones. I can't get behind my SX-1250 right now to look, but if memory serves me correctly, the original ones were just slightly squared-off U-shaped wire things, about the thickness of coat hanger wire, and silvery in color. All the big SX-#50 series had those same jumpers.
I wouldn't consider that a critical objection, unless you are trying to assemble a purist's collection of "perfect" pieces, in which case you'd look for one that still had original packaging, documents, etc... and was in pristine shape. If you are just looking for a nice one that performs well, at a reasonable price, this could do fine. You could use thick copper or silver wire, or short cables like the ones in the pic, although I'd be inclined to make something with a little higher quality than that, at least something with a bit thicker wire (lower gauge), perhaps using Mogami star quad wire and good-quality RCAs, or maybe just thick, pure silver wire bent to shape. Anything that will carry the full signal without loss will be fine, and it is a very short length to worry about.
At that price, it's a nice-looking fixer-upper. Probably a good way for someone on a budget to add an SX-1250 to their collection. I paid a similar price for mine, complete and original but in need of some TLC, several years back, and was/am very glad that I did. I haven't seen another one locally, since then, at any price!
