I remember the thrill I got when I found my first trackable in a cache. It was amazing! It was an honor to help move it along and release it after a few weeks of traveling with it. I want to give that same thrill to others . . .but cheaply, LOL. So I only have a dozen or so released, but my secret is to attach the plain metal tags for the cheap ones to a happy meal toy with a hole drilled through it - so it's interesting, but not collectable or playable for a kid. I use a steel cable keychain with a drop of superglue in the screw, to attach them. For "high end" trackables, I definately use a proxy, and keep the original. I also have shrinky dink paper to write the trackable number on, and attach to a happy meal toy or dollar store toy, and set it free. I have some that have apparently stopped moving, but plan to wait for at least a year before releasing the second proxy for them.