They were fortunate to have the funds for a guard. Most digs don't have that money so security through obscurity is the best alternative. It's a common problem

They were fortunate to have the funds for a guard. Most digs don't have that money so security through obscurity is the best alternative. It's a common problem in the American southwest where, if news of a new site gets out, pot hunters can come in, strip, and destroy a site over-night.