Wilf -
Having you name known in a Post Office in America is not that bad...having you picture posted in a Post Office in America - now that IS bad.
You are correct in your guess about the import duty rate - it is however an inverse rate.
New large panties have a much lower rate than used smaller sizes. Amy's panties are quite small - with a natural floral odor that is quite pleasant indicating mild use - so the rate on these should be the higher rate.
You may be able to offset some of the import charges incurred by charging for sniffs from fellow club members.
ERA535/007