Shipping out of country.

In Brazil it's very simple. They find out value and it doesn't match declared -- the item repossessed and will never reach customer.
If you're sending some small stuff like watch or CD it's fine. For components and speakers watch out.

i would back off unless you're salty enough to send at risk.
make sure that you get sign off on all customs declarations as agreed and done in writing.
tracking only helps you to see your item lost and never returned, but it won't say it's in customs.