Does anyone use Avid system? I paid $20 for the microchip (back in October of 08), and rereading the Avid pamphlet, I see something about "PETtrac", a global recovery network, and paying a 1 time fee of $18.50 to register with "PETtrac". Is my Ein already registered with the Avid system, (since he has the microchip IN him) or do I have to register with PETtrac as well?