Back to the original question and topic...
When you have the coin in hand to have the tracking number and you have control of the coin.
Originally Posted by JustKev
Your options are: retrieve it, grab it, write a note and discover it. Now that being said I have seen this trackables thing have glitches.
Once it is in your inventory you can only discover it, or write a note about it, and of coarse drop it.
I suggest picking a cache, dropping it into a cache, then picking it back up and see what happens.
Don't let these fancy pansy, glorified calculators dictate. When mine start to act up I have a 6 pound ballpeen hammer I hope in my hand and say the words "Work or I fix". Everything seems to be fine after that.
Just don't turn your back on them after that. Always walk backwards like walking away from a rabid dog.
I have no enemies, but I'm intensely disliked by my friends.