Good to hear from you, Kat. I, too, have less time to spend here these days.
I would think that you could call your agricultural extension office. Yes, they are a state entity, but they should know about federal laws re bringing plants into the U.S. And they would be easier to reach than trying to get someone from the right department in the federal government.
I can't even guess. I hear people say, "I brought this back from our trip to Mexico." And you hear about nurseries introducing new plants that were developed overseas. But then, if you are returning from outside the country, they ask if you are bringing any plant or food material, and if so, they confiscate it. If you admit to having been on a farm or rural area, they make you take off your shoes, spray them with disinfectant, and seal them up in a baggie, leaving you to walk around in your stocking feet.