I was reading about that in the L&C chat as well lol They were saying that the statute of limitations does not start until it's discovered.
Just doing a quick google search, I found this ...
California's Discovery Rule
It is important to note that the statutory period for bringing a case does not begin until the offense is discovered, or should have been discovered.
California Criminal Statute of Limitations Laws - FindLaw
If the above is true, according to DuGal, he had no probable cause to get warrants for bank accounts, etc. So they (CM's financials) were never searched until after the bodies were found in 2013 by the SBCSD. If the statute of limitation is 3 years... that gave them at the very least Nov 2013, when SB took over and now had probably cause to get search warrants, until Nov 2016. Now, why didn't they file any charges related to theft, fraud, etc. IMO if it did indeed happen, they would go hand and hand with the murder.