Note that although Regular Airmail is trackable in most cases as well, tracking information becomes available only on delivery (or attempted delivery) of the order.
All medications are obtained from legitimate pharmaceutical wholesalers, so you can rest assured you are receiving the same medication as you would at your neighborhood pharmacy.
This is accounted for by the possible differences in their inactive ingredients such as color and flavor additives, and by the copyright and trademark regulations that does not allow for exact copies of the existing brand-name products.