OK, What Should Tom Do With His Challenge Coin Collection?

My wife and I are de-cluttering the house, a move that, as we review the detritus of the decades, is overdue. It turns out that in addition the massage table (?—we think that’s what it is—someone left it at the house), many coffee table books, tons of hangers, unused bathroom wall tiles and such, there is a challenge coin collection, maybe 75 in all, that must go. What should I do with it?

Meanwhile, a peevish question: In the opening decades of the 21st century, did the risk aversion of American commanders increase along with the size and popularity of challenge coins? Is there a relationship between the two phenomena?