Hello all. I ordered about 20 silver coins from Kitco a couple years ago. I was a Noob, and I touched the silver with my bear hands. When I checked on them a month ago, they appeared to be dusty or dusty from putting my fingers on them. That made me nervous and I just stashed them away for 2 years and never cleaned them. Is there damage on them now that hurts their value? Can I still get full (or close to full) price on them? Should I clean them? What should I do if I want/need to handle them in the future? Thanks.