Why do you say USPS can not open packages.. I've had many that have been opened and then resealed with their sealing tape. Yes they can open it if they have a reason to and anyone can think of a reason. In a perfect world every shipping company works... in out courrupt world every shipping company has its horror stories. Just make sure you get a tracking number/reciept and insurance on the item and you'll be fine. I seem to have the best of luck with ups, they are the only ones to seem to have a somewhat working tracking system.

-Greg