It could have been there for a number of reasons. Just some kids playing games, someone trying to get revenge against the store because the store cheated or fired them, someone checking responses, someone trying to extort money from the store, or a typical liberal nutcase. However, it they get caught, the results will be the same. I think the fine is up to $20,000.00 plus a little time in jail.
The biggest issue was "What's a Simulated IED?" The next was the composition of the device "water?"