Other suggestions (and they depend on how aggressive YOU decide to be):
1) Write a letter to the local manager with a copy to the national manager (assuming this is a chain). Send both of these certified RRR. Detail what happened and that you followed 'company policy' (if you did or if there is one). Detail your 'damages' that you suffered and that you expect to be compensated for them (since you were on company business at the time, etc.). Give them a specific time to respond (14 days from receipt??).
If they do not respond (and here is where it gets aggressive), you might want to make sure that the local media (papers, tv, etc.) know about the dangers that your 'pizza boss' puts his employees with no protection, etc. I am sure that the local angle story would get some pretty good 'press' and probably get you some compensation for your loss. WARNING: Be aware that this action could also backfire and cause potential problems in your future hiring, especially if you plan on staying in the 'pizza biz'.