He sold the original photos? Damn. Could you maybe find who he sold them to?
I've looked everywhere for high-res stuff and even though about buying that book but it really wouldn't be worth it. There doesn't seem to be a great source for these but a lot is still do-able with what there is.
Btw, if you wanted a good DK Jr, just rip the one from pica-pic. Even the animated buttons. I just didn't want to.