It's a neat idea, but I agree with the other posters, it's probably not practical. In my own case, the quilt itself is so distinctive that it really doesn't need a microchip to identify it, and it is labeled.
The best we can do is be very careful how we ship and secure them. Make sure the quilt has an appraisal, and ship it insured. While the $$$ doesn't replace the quilt, it's better than nothing at all.
Janet