My question involves personal property located in the State of: New York

I recently moved out of my now ex-girlfriend's apartment. Her name was and still is the only name on the lease, but I had all my bills/bank statements coming to the address. She also changed the locks when I moved out. I have been trying for two weeks now to return to gather some personal belongings, including a few items of clothing, a TV, video game system, and a few odds and ends. She has been unresponsive to both telephone calls and emails. I went with the police to her apartment, but she did not answer the door. The police told me that unless I can get in touch with her to let me in, they cannot do anything. What options do I have at this point? It seems that as long as she doesn't answer my phone calls/emails or open the door (whether the police are there or not), she is able to keep my stuff. Am I allowed to get a locksmith to open the door? Any help would be appreciated. Thanks