I really appreciate you clarifying this, I hear so many negative things from folks about registering the birds in Maryland. Mine have been registered all year and no one has come to inspect or bother me. It was very easy and the little card stating that I had registered came in the mail in a matter of days!
That is all that will happen, unless there is a problem. For instance, if you live within 5 miles or whatever is deemed necessary of a place with an outbreak of disease, you likely will be included in a quarantine, where any of your birds that die would be tested and you can't move any birds in or out. That is all. Nobody is ever gonna come inspect in normal times.
Just take that little card with you to shows or swaps and that is all the proof you need.