[Webmaster]

its Philatelic material. The law dose not apply to them

Let me know how you make out when you get back from the Post Office. The rules changed on August 29. Americans know nothing about what other countries now have to do to send parcels into the United States. You may have been sending stuff successfully in first class letters, but Canada Post will not accept a parcel for the United States without a customs id number provided by an online app called "Zonos". 

You are correct about the "no duty or taxes", that's why I recommended HTS code 9704.00.0000 which is for philatelic items, including stamps, covers, FDCs etc. But that does not avoid the current necessity of a formal declaration through the app.

Roy