Minor note to all- the criminal statues vary somewhat state to state. Here the crime is concealment of merchandise. You do NOT have to leave the store, walk beyond a register, etc. Same applies to deliberately altering a price tag. Merchant or agent of merchant is permitted to apprehend you and hold you for up to one hour pending arrival of LEO.
In the story just related, the sale was refused for good reason (no ID, and an age requirement for the item). Having been told he could NOT buy the items, the doofus put them in his pocket.
What we have here is... failure- to communicate.