ok here's the thing. You bought the beer with the intention of taking it home for yourself. What will show up on camera is you denying their attempt to purchase beer, then you buying beer and placing it behind the counter. Then it will show one of the deli guys coming over and picking it up and taking it. Basically it shows a scheme of you buying beer for them and smuggling it out with the trash. Even though that is not what was intended, that is one argument that the video will show. It will end up being your word against everyone elses.

Best bet is to tell the manager exactly what happened and be completely honest about everything.