Is it legal for my manager to open my paycheck when it is sealed and has only my name on it?

Question Details:

About 3 weeks ago I picked my paycheck up from the desk in our office and it had already been opened. I questioned my manager about it and he told me he didn't know anything about it. I then called our main office to ask if anyone knew why it was opened and the owner was very upset. He informed me that he would speak with my manager about it and later told me that my manager admitted to opening it because he was just curious how much I made. Can I take any legal action against my manager, and if so, where should I start?

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