Foreign/customs letter. Domestic/hmmm...
Seizures are one thing. But search warrants are another. The odds that you'll be the only one who doesn't get a customs letter, but a DEA agent at your door instead is very high. Customs already has a high workload and it's much easier for them to send out a letter than to take legal action against you. And AS aren't that high of a priority. But to play the devils advocate I'll ask this question. If your domestic source goes down would you be scared? You better hope your source has some good encryption. More important you'd better hope that the authorities are satisfied with their catch and don't go out looking for more.