You dont have to have 30 birds for NPIP. if you have less they just test all your birds you have. Most states will except a vet certificate on adult birds. You can usually find a local livestock vet to do that. Call the state vet office of the state you are moving to ask what there requirements...
Im so sorry but the longest you can keep a egg is for a few weeks after 7 days the loose moisture weight and viability. No matter what you do the shell will continue to breath. Broiler hatchery's have done tons of study's on how to preserve a egg for later hatching. But the best I saw was with...