I would hold BWP liable for the loss "IF" you can prove he had them in the first place, IE: a receipt of some sort with signatures and dates is ideal.
Theft is theft, if you have the evidence and have asked them repeatedly to compensate you for your loss under his watch, you can take him to small claims court. Most people will just settle before trial but don't expect full value and be prepared to wait 5 years as is in my case.
Don't expect overworked, under-trained, public servants to do the leg work for you. Build a case yourself and remember Google is our friend!
I hope this helps.