ABCs for geocachers

My friend and I like to geocache, and one day we had an idea that it would be really cool to leave a small business card sized ABC’s of salvation in a geocache. People often leave little trinkets behind and we thought this would be perfect, so I had some cards made where it asks on the front “searching for real treasure?” and the back has the basic ABC’s with some scripture and information. This could probably work with things other than business cards, but this was the quickest thing we could get made up for the lowest cost. Are there any geocachers out there? Have you done anything like this when you go geocaching?