I'm sure Garrison shot up the list of suspects when he offered some of what he knew when facing a 3rd strike felony on the FIP. Once LE heard the amount of detail he knew, which led to the successful execution of 3 search warrants with evidence recovered, then they knew he was likely involved and this was not just hearsay that he was repeating.
There certainly is a possibility that some of what was recovered could pertain to other crimes but the only thing we know about for sure covered by a search warrant is the 50 yr old male. But the fact that LE sent things out for lab testing, then sealed the results to this very day should tell us there is something to the evidence they have. They would not spend the money to test just anything and then seal negative results. In the case of the evidence collected from Cassville, Moore has obviously spoken about the disappointing results from the DNA testing on the deteriorated blood sample recovered but he doesn't speak to the other evidence such as the green metal. Had the green metal turned out to be part of a 1952 Packard Clipper for example, then I'm sure he would have spoken to that as well. If they had only recovered junk there would have been no testing & sealing of the warrants.
