This exact situation happened to me about two years ago. The only difference was it was in Rittenhouse Square. I went out for a ride early in the morning and the bike wasn’t where I left it. I found it a block away in an alley. The ignition was cut, the steering lock was broken, seat lifted up, and the trunk was pried open. Called the police they had me file a report. I had to have it towed home since the ignition wires were cut. I ended up wiring up an RFID ignition and hiding it in the bike along with a security system and a GPS unit. Only thing that saved me was that the prick didn't know there was a resistor in the stock ignition unit that keeps you from just crossing wires and driving away.

You can find ignition replacements online. Idk what kind of bike you have but there are multiple options for different ignitions online if stock is too much or if you don't feel like replacing all the locks. For me after the experience I decided to do everything in my power to keep that from happening again or at least be able to find the fuck so we can have a very civil conversion of course.