The 440 LE is not a scam. The customs duties are 50% of what the total value of the package is, and if there is no receipt or stated value on the customs forms (filled out by the sender) then the post office is left to estimate the value and they can estimate it however they like.
Packages sent by private courrier are also opened.
If you want to be sure that you're not being scammed, then sign up for one of those programs, such as Shop & Ship by Aramex, that funnels your packages from a US or UK address and pays the customs tax up front for you and gives you itemized receipts of how much you owe them.
This is the price you pay for living in a country that isn't part of a free trade agreement; and it's quite ignorant to simply assume that it must be the bowwab ripping you off. If you worry that the bowwab is telling you more than the actual fee, request the receipt from the postal carrier, or tell your bowwab to have them deliver the package only to you so that he doesn't have to pay the fees up front in the future.