Sounds like a nearly perfect experience once some bed-wetting hoplophobe decided to make what was probably in total a false police report. Other than the dispatcher asking some questions to head off the entire thing that is.
But once the cops showed up it sounds like the cops handled it very well, as did you, and the store employees and other customers.
Now, if the cops would just go back to the office and have a few words with the dispatcher.
OTOH, you can imagine how quickly this could get very dangerous for the LAC if the cops were not to handle things so well. Either or nine guns pointed at you by guys who are hopped up on adrenaline wondering if this is the night they don't get to go home is very dangerous. It only takes one person making one small mistake to put you into a casket or wheelchair.
Idiots or provocateurs making bogus MWAG calls should be heavily prosecuted, similar to fake bomb scares.