“So what am I supposed to do with all of my Beretta 92 mags that hold 15 rounds?”
No, strike that. The note should indicate that you identify as a retired black, female, lesbian police officer.
Seriously, don’t get caught with those mags anywhere in the state. I lived with dozens of 20- and 30-round AR, Ruger Mini-14 and SKS mags for about 10 years before moving out. Heck, I BOUGHT them (in Pennsylvania and mail-ordered to my job in NYC!) during the ban and brought them in. Keep it for an emergency...or sell it to someone who actually lives in the United States one day when you travel outside of the Peoples Democratic Republik of Neu Joisey.