Hi Cuki! Welcome to JREF.
I think you have it backwards though. Your involvement-o-meter requires you to take either the cops word as utterly authoritative and beyond question (regarding the interrogation) and ignore the notable discrepancies in it, the abuse to logic and plain common sense, and the fact the statements were thrown out by the Italian Supreme Court. Oh, and also the fact there's no tapes which is a violation of article 141-bis of the Italian code, that's
not an argument for those skeptical of the police in this regard, quite the opposite actually.
Regarding the 'no theft' statement, again you must maintain with absolution that the only interpretation of that implicates Raffaele and Amanda in some kind of involvement in the crime. That would be ignoring the numerous scenarios where it is actually exculpatory to some limited degree or entirely meaningless either way. At the same time you must ignore with absolution the numerous indications that the cops messed up and that Mignini is a screwball who last made the news in Italy digging up corpses to check their pants sizes and haircuts in pursuit of a famous murder case almost twenty years cold.
As of his CNN interview this spring he still believes he was right in that endeavor. I can't help but wonder if the fact the body was underwater for some time before discovery and had been buried several years might explain why the pants size differed, and if he was actually interested in the truth of the matter before he dug up his second corpse he might have tried some DNA testing as that works too sometimes...