As far as the table eggs go, there are some different rules/regs depending on how you sell them. For us, we just sell eggs to family, friends, and coworkers and don't take the eggs to farmers markets or stores etc, so per Ohio law, we don't need any licenses or inspections. Our eggs are considered "ungraded, mixed sizes". We can mark cartons that way.
For shipped hatching eggs, most states require health certification (like NPIP papers) with shipments into the state. That being said, I have never heard of a situation where USPS opens a box marked as eggs to check for paperwork. There are many people (especially sellers on eBay) who aren't NPIP and ship all the time.
We do participate in the NPIP program and Avian Influenza H5/H7 testing. In Ohio it was $35 for the year and I feel it's definitely worthwhile. I don't have to worry about shipping and other people who are NPIP can buy from me and stay in compliance with the program
I don't ship birds, but when I sell them locally I can sell to other NPIP members. I think it also gives buyers confidence that the NPIP members are trying to maintain a healthy flock. Granted, lots of people take excellent care of their birds and aren't NPIP and have just as healthy birds as I do. It's personal preference to join the program or not- it's not mandatory.
X2!

they're beautiful!! Congrats!!