After listening to other sellers at eBayOnTheRoad in Vancouver, I realized that a lot of people think that they must check either the box that says GIFT or SAMPLE OF MERCHANDISE on the green Customs form.
This is not correct.
If you read the form, it says 'Check IF the item contains:'
So, if your pkg is NOT a gift and NOT a sample, those boxes are NOT to be checked.
*JMHO* - to be taken with a grain of salt!