The blue one looked more permanent, the brown, who knows? Perhaps we should all band together to rent a port-a-potty and then just put a lock on it, and distribute the combination to those who contribute to a fund. Lock er up when your business is done.
I may be pissing up a rope here, but methinks if you lock a terlit so that only a select few can make use of it, it won't be long before the Great Unwashed that don't enjoy similar access will reduce the facility to a pile of broken plastic. This is the nature of things...