Bicycle detail

The bike was locked up to two other bikes in my backyard, both gates to the backyard were locked. They cut the padlock on the gate and then the 3/8 braided steel cable bike lock cable. I had a Ulock on the cable as well which is intact. They only took my old 1995 Marin (with the Tange ultralight custom tubeset) for whatever reason. It's not worth a whole lot, but has sentimental value. All the parts but the seattube are frankensteined from newer bikes.
I don't have proof of ownership unfortunately, so hopefully my knowledge of its weirdness is enough.