You have expanded the question considerably. Originally, you described "personal belongings" as the limit of the search. Now we're talking about your car.
In theory, you could call the police and have whomever actually conducted the search arrested for criminal mischief or vehicle tampering. But, it's a close call, unless the person actually tries to open the trunk or your glove compartment, or move the vehicle -- or takes something from your purse, etc.
Without a clear removal of your possessions or movement of your vehicle, it could be difficult to get the police to arrest. Which leaves you back with the a civil action, such as invasion of privacy, or interference with personal property.
Criminal statutes are very narrowly interpreted. I don't see a particular criminal statute that satisfies your facts. There may be one, and I'm just missing it. You can always call the police and explain what happened and see if they are willing to investigate further.
But, I have a hunch that the only way you can get anywhere here is to sue the employer.
For an employment rights lawyer referral, see this link.
Hope this helps.
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