Ok bro,

First off, for a small amt of gear you don't have to worry about a controlled delivery. Just seizure.

Secondly use the USPS, your chances are best just by sheer volume of shipping.

It is true 1. that fed-ex/ups/dhl can open any package they deem "suspicious"

USPS cannot, they often need what is the equivalent of a court order to open your mail.

From an experienced pro....

USE USPS, PRIORITY SHIPPING.