the usa has very strict laws regarding the importation of any seed from international locations. you have to have paperwork to show that they are allowed here. its to keep invasive species out and pests that might destroy some industries. also to protect creator rights for certain flowers and veggies.
There is tons of China sellers selling veggie seeds on ebay cheap now, I do not think they bother with paperwork, I'd never buy Chinese seeds anyway.
My limited experience this with weed seeds this year are: Order from Canada lost. Vendor resend the seeds, lost again, no letter or anything from Customs. Then I got P.O. box in different town and zip, next "stealth" order from same Canadian breeder come through, then order from Nederlands came through also. I have no clue what to make of it. What are odds of 2 consecutive orders from same sender to same recepient being "lost"? astronomical, perhaps higher than winning lotto.
That tells me that likely some sbitch from local P.O. stole my seeds twice.
When I order from Holland I am trying not to order anything from Amsterdam, since word Amsterdam is a synonyms with dope here and around the World I guess.