But, in my experience, some items take a month. My theory is that they get thrown in the surface mail basket by mistake. I do know that some items sent surface mail arrive in airmail time, usually about a week when I was shipping loads of packages to USA. Stands to reason the opposite could happen.
You have 45 days from payment to start a not received claim, so no need to do anything yet.
============================================================= af," a reduntant, uneducated, diatribe spouting fool."