When I did a bulk order for our track, I called and made sure they got it. I had full tracking and insurance. When I did talk to them on the phone, they get in from Holland, a new set of transponders to sell, they are usually 100, to 200 at a time. Usually split between hybrid and rc4. So you can see how they go fast... If you are getting unique id then I am sure its longer. They have to send the info to Holland, then they make it and send it out.