Yes
Nah, I don't do that on items that require Registered Mail and I don't know why any seller would want to ship global priority or express mail. That is unless the buyer is paying for that, because those two cost way more than Registered Mail and they all have the same result. The result is online tracking and signature verification. Those two give a more specific date of arrival (2 to 5 Days), but cost more than double the price of Registered Mail.
do you do that on registered/global priority/express mail packages??? what if it gets lost in transit and they retrieve and the customs for says (0) / gift / other???