Within days, aurors have investigated Azkaban and exhumed the supposed grave of Junior, only to find the remains of a woman in his place. Of course, confronted with the evidence (and with a healthy dose of veritaserum in him), Senior is forced to confess it all. His wife’s dying wish, the Polyjuice Potion, her trading places with Junior, and Junior spending all this time a prisoner in his home instead, under constant imperius and watched by Winky. Investigation yields no evidence of Death Eater activity, and it is therefore assumed someone with a personal grudge against the Crouches is responsible for it, choosing to use it to draw the attention of the aurors to Junior’s presence, as he is a known Death Eater