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Was it a piece of paper inside the enveloppe? I find it odd that the Customs would feel the need to open the enveloppe if there was no solid object or hazardous substances detected inside.
Some drugs can be effectively hidden in an envelope without any outright sign, '___' can even be transported in quanitity soaked into paper.
Also, someone else posted here on a similar topic that customs is very interested in stopping child pornography photographs, which are just paper themselves.