You could have stated that you didn't permit him to take possession of your property. That would have established, in my eyes at least, that he could not check them.
If it happened recently, you may try contacting whoever is in charge if you feel the trooper was out of line.
About 3 months after it happened I was able to speak with the FTO that was also there during the stop. We talk probably about 10 - 15 minutes about it and he acted as if he understood my side of it. I just don't know if it went anywhere after that. Also the FTO didn't say the rookie trooper was in the wrong but I'm sure he's not allowed by policy.