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Have you tried more than one tool to verify they are indeed not showing up? Try a few other backlink watching tools, just to double check. Raven tools has a great link checker, as does Ahrefs. Visit the actual page where your links were supposed to be placed, to see if they are still present, and inspect the link to verify it is "followed", and not a "no-follow" Also, were the links that were acquired paid links? Could be that the linking site got hit with a penalty. This is all just speculation, based upon what you have said here. I would do a bit more research, to try and see if the links were truly removed, if they are followed, or if it's just not showing up in MOZ's link crawler.