Interesting. I've probably received 8-10 shipments in the last 4-5 years, without ever getting such a notice, including a couple in the last couple of weeks. I wonder: the notice refers to "UNAPPROVED PRESCRIPTION MEDICATIONS." The ones I have ordered may have been approved; they did come from recognized pharmaceutical manufacturers, in some cases in Israel, other times India. Anyway, the boxes I received had not been opened (and were not obviously medications, since the return address did not identify the sender as a pharmacy or pharmaceutical manufacturer), and the shipping info was inside the box in all cases.
I wonder if this is a new enforcement policy. I'll await with interest my next order. In my case, I could always as a last resort buy prescription meds in Canada, since I am there four or five times a year and purchases for personal use are allowed.