JMHO Crime & Murders happen because they have intent & motive. JMHO intent & motive of SS Mansion Quad Murder not necessarily in this order: Revenge, Anger for people who have a seemingly good life, A coddled son that appeared to get everything, THEFT of valuables, Theft of Autos, Theft of Cash. But more importantly a quick hit could NET a lot of cash & jewels. & by the way, one or more of these could have become abandoned according to how it all went down.
So regarding the jewelry & smalls that would be the simplest form of theft. New York has "diamond district" & many a bit unscrupulous shops there.So good place to fence jewels. interesting that he had a girl there. ..... so my parting note.... why do you think they call it a CRIME "RING" anyway??...