Wow, that is messed up. The one that actually pulled the gear and put it in the stroller was smooth. He even did the extra loitering before leaving. I used to see shoplifting all the time at my dad's stores when he used to own them before deciding to move on to another more lucrative venture, but this is up there on the fluidity of their actions.
Stupid tweakers. I've seen one break a car window to steal change and a candy bar. Sorry about your loss, hopefully they'll get prosecuted to the full extent of the law.