Roll The Dice
The bottom line here is the rules are "interpreted" differently by everyone who runs into them.
Regardless of how dilligent you are in storing and transporting you gear, the police officer you run into, his/her mood at the time, how your conduct makes them "feel" about you are what will determine the outcome.
All I can control is the way the guns are handled. So I do to the best of my ability. I made a decision when I started airsoft to treat the guns as "firearms".
They are stored AND travel with trigger locks in locked hardcases.