HERE''S A THOUGHT, NOT THAT IT MATTERS MUCH BY TODAYS STANDARDS, but they appear to be a sad case of vandalism!!! For whatever reason if an artifact can't be collected as a souvenir then it must be defaced? This is only one man's opinion as I've been satisfied to have been a part of the history & left all behind for the next generation to experience! The adventure experience, however, has the most going for it & probably has to be learned to be fully appreciated! The collected souvenirs harm the archaeology of the site & go off to a dresser or patio to be later forgotten! Some could be sold or wind up years later as 'garage sale' curiosity bring a couple of dollars. Enough diversion for now.