Sth wrong with their bar management

My purse got stolen there. And I was holding a happy hour party, not as a normal guest, but as a work staff.

I put my bag behind the bar with my laptop (had to prepare some slide show for the event), and after the party, I found out everything else was still in my bag but my purse. I don't think other guests would enter into their working area to steal sth.

I know that place is not purposed to put your bags and other things normally. But I had to work with my laptop during the event and I needed things from my bag, and before I put there I also asked their manager for permission.

Money is always not that important in this kind of situation, I just wish they could give back my ID card after they got my money.