Wow. Bastards for stealing it and bastards for ruining it.
Zero says to check SOC monthly, as "Leaving the power pack discharged below [30%] for a prolonged period could damage the power pack". Going by the first paragraph on
https://electricscooterparts.com/troubleshootingbatteriesarenotcharging.html, it is definitely destroyed. The voltage will have fallen off the cliff.
It would be interesting to know the SOC in case they actually did plug it in. Unlike implied above, I don't see how it's rocket science to find the receptacle and plug it in (using the cable from a stolen computer of course).
Whether the insurance co realizes it or not, they should classify it as "totaled", and as they have no idea what to do with it, they might practically give it away.
Zero's charging recommendations page indicates that "While unplugged and keyed off, the motorcycle’s electronics will consume a very small amount of power and the pack will drain extremely slowly". It would be interesting to know the various trickle rates for the bike electronics, BMS, and other internal losses.