Are you sure it didn't say, "Scanned by customs"?
Well legally, you can have a 90 day supply of FDA approved drugs in your possesstion, however, chances are if it was opened by customs, it was too small of a bust for them to make a big deal out of it.
In fact, one of my first packs, I had ordered some Clen, and my supplier wrote on the inside tab "90 day supply", I guess just in case it did get checked by customs.
However, I would be willing to bet, that your addy is tagged, so next time you may want to use a different address to get your stuff in. Just my Opinion.