I live pretty close to the Silver Nugget- should I go pick up a few more of this possibly short lived issue or just get some more to preserve untouched before table play gets them dirty or wears off all the printing?

I guess you can usually say this about any casino chip, but it looks like this issue might get replaced soon if they start looking like chips from Gambler's store. It really is quite a plain, plastic looking 'mold'