If you find a yellow sticker on a package (it might originate from Amazon) that reads Goods Do Not Meet The Requirement Of Article 9 and 10 Of The Contract For The Foundation Of The European Community or the text Goods not fulfilling the conditions prescribed by Articles 9 and 10 of the Treaty establishing the European Economic Community, it’s almost impossible to know what this sticker is all about.
Let me explain in short: the sticker is added to the package since the package was transported in Europe by a European package company/operator, BUT the package itself is did not originate from Europe (but rather from outside the EU, such as the United States or China).
Online companies like Amazon always try to deliver your package as cheap as possible so they can keep their prices low. Thus, they make deals with European companies to deliver some of their packages with European destinations to reduce costs.
So to conclude, the sticker is just a little warning or information label that informs operators that custom duties and other fees still need to be paid on this parcel – even while it was handled by a European company.
And what are articles 8 and 9? They are all about intra-European exchange of goods and services, so they refer to import tariffs and the like. So now you know!
This particular package came from the USA to Belgium.