The last AMT kit I bought is the International Pay Hauler dump truck. It was i believe factory wrapped. If your kit was not wrapped them it may have been a victim of theft. Perhaps you can contact Round 2 or AMT and see if the parts can be replaced, hopefully at no cost.
A long time ago I built the 24th scale Stuka from Airfix, it was missing wheel spats. Wrote them and they replaced the partd free, that was along time ago though.
It is unfortunate that QC fails, truely no excuse if it is electronicalky accounted for, frustrating but somewhat understandable if human hands are inventorying the final product. Bummer that happened and I hooe you can get it resolved.