Hello all I have some coin sets and I have them in cardboard cases (as seen in pictures). They were in a lock box where none of the documents were damp or wet in there. Well some quarters started turning green on the edges. If I take it off the finish comes off so they are ruined now sadly. Question is: How should I store my coins, is a box with air flow better then a air tight safe or maybe have Silica Gel in there too? Assuming there is nothing to do but replace the coins now right? I also have a few bills they are not moldy or green but they smell musty, what is the best way to store those? Thank-you in advance everyone.