If your order contains more than one item we might ship them in multiple shipments. Therefore we strongly advise checking the information related to the status of the order (including shipments) in your user account or in our Help Center 

We would advise to first lookthrough How can i track my order?

If the information provided in the user account or is unclear or shows all items were delivered - please use one of these two options:

use the option " Report Missing Items" in ( Help center )