Is it acceptable to leave Saint Benedict Medals in Geocache?

I am an avid geocacher. For anyone who is not familiar with geocaching: there are many boxes hidden around public places like parks and hiking trails. You can leave little trinkets in the boxes for others to find. I have been leaving replica dubloons (Pirate coins) in them. The other day, I had the idea to start leaving something holy like a Saint Benedict medal. You can buy medals in bulk that come with cards explaining their meaning. Would it be appropriate to leave them in geocaches for others to find or should they not be left unattended?