Glad he got t back, there are Faraday pouches on Amazon and also they make a kill switch that has its own remote so that you can still us your remote start, so 2 remotes but one is killing ALL power coming out of the battery until it is activated.
Just a thought, I use the faraday pouch at home and on the go, the work, I tested it from inside the vehicle itself and NADA.
I saw on youtube the bastards went on a guys front porch and stole the signal from his remote and then used it to drive off in his rig right from his driveway.
Cheers