Need some input regarding US mail legalities and baseball cards

[hcv123]

Here is the short version:

I owned a business. I sold the business in July. I was working for the new owners who showed themselves on multiple occasions to have no integrity. It got so bad, I quit and walked out on December 2nd. Prior to that I had been receiving some personal mail (including ebay winnings) at the business address.

I had won 3 ebay auctions that were in transit when I walked out (I immediately put in an address change). I was in touch with a former employee of mine who stayed on with the new owner and asked him to keep an eye out for the packages and if he would bring it to me. He texted me that the first package arrived and the new owner opened it and would hold onto the cards (presumably because he was angry with me for leaving and he is just "that kind of guy").

I did some on line research and thought I learned that because the packages were addressed to me personally even though they were delivered as addressed - that anyone else opening it is mail theft.

I attempted to contact the USPS postal service inspectors - I was initially told the case had to go to the local post office first - the local post office called and was confused why the case went to them saying they delivered the items as addressed. I left a message with what was supposed to be the postal inspectors again after that call. Still waiting for a call back- that was 2 days ago.

Rather than waiting I went to the local police station. An officer met me at the business location - spoke with the new owner who opened and has my cards who lied to the officer and said he had no idea about any cards. The employee who I communicated with was at the business - the officer saw no need to speak with him and told me it is a civil matter and I need to take him to court. I asked about mail theft being a felony. He essentially blew me off.

Any experience or educated input from anyone here?