Damn Jeff...sorry to hear about the streak of bad luck.
Like Natty said, I would be sure to have your witness give a full statement as soon as possible, before the events slip from his/her mind. Also, is there a way to find out who the delivery guy was, so you can document that as well? Maybe get in touch with your local distributor (?) of Coors? Would they be the ones that dispatch the drivers to the stores? In all experience I've ever had with dispatching, most companies keep a thorough log of who they dispatched when and where.
Good luck, I hope everything works out well for you in the end.