There is a sticker yes, and a folded page in a plastic bag attached to the package.
Whatever you want to call that piece of paper, the customs officer referred to as an invoice and use it to calculate the taxes I paid.
Besides, it says right on top of it: COMMERCIAL INVOICE.
http://imageshack.us/a/img853/4759/g3.jpgI am curious, what made you think that
there is no commercial invoice outside or inside the package ?
Whoops. Okay, maybe I'll have to take a close look at the package again this afternoon.
In the German BFL forum some people said the shipment came without invoice, so I expected the same. Even more so as my order was removed from my account page after shipping and I could not print an invoice myself.