Posting goods as documents.

[Nivis]

Does anyone have experience of sending goods like cosmetics or supplements internationally via Fedex and stating content as documents? I wonder if customs cheks such packets in both country of origin and country of recipient if they are thin enough and look like documents. I (and not only I) had experience or receiving cash card and token for bank via Fedex though it is not allowed. Please adviseif someone had such experience of using Fedex document mail for shipping goods internationally.