He was also was in Livermore buying bondage gear and other things from a sex shop on first street. I am not sure if he got the curling irons from the target which is close to the highway.
Dublin is just down the highway a few exits. Since he was roaming Pleasanton, Dublin, Livermore, Tracy, it seems like his hunting grounds. I do believe Michaud knows because that was how they got off, as disgusting as that is. I also believe Ilene may have been buried near other victims that have not been found. By the time they took their final victim in Pleasanton, it seems to me they were very comfortable in destroying human life. I am certain if she wasn't involved she knows. You don't just go from nothing to torture, rape, and killing.
If it was up to me we would be waterboarding both of them daily until all of the answers came out. As well as a few other on death row.