Thanks for the notice -- I mail internationally a couple times a year, and I always wondered why I couldn't do this online -- now I can!
For those questioning whether the forms are even necessary, it depends on type of mailing and value of object. If you scroll partway down this page (to where it says 123.6 Required Usage) it will show a table that tells you which form you need, if any, depending on what/how you are sending it. (looks like the only things that can get away without any form are "documents only" packages)
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