1-Great that not only did you get your car back, but everything inside as well.
2-If your alarm is like mine (1998 Subaru OEM alarm) I just cut the wire to the "speaker horn" that's in the engine compartment near the passengers strut tower. I cut the wire while tracing an electrical issue many years ago since the battery would go low and trip the alarm. Never hooked the "speaker" back up.
PS, you may want to spend a little cash and take it to AZP to get a "look over" to see if there is any damage which your insurance may cover. Also get the "AZP special switch" installed. ;-)
Oh, forgot to add, many years ago a friend had a similar issue. Car stolen and then found.........15 years later!! It had new tires, a new battery, misc other work done but still had an umbrella & newspaper that were there when the car was stolen. Go figure. LOL