More importantly, obtain a copy of the police report (at the
station itself) to submit to your unit S1. Otherwise must go down
separately to the police divisional HQ elsewhere for it, as I
recall.
Up to you on what story to spin about the loss of the 11B. ~shrug~
Cannot win either way: can be charged for making a false police
report, vs. must sign extras back at unit if it's clearly your
negligence.