Find the tracking number in your Deliveries or Home Deliveries screen in MyAIT and click on the tracking number to display the HBL Details. From there, click where it says HOME DELIVERY near the top left of the window.
In this window, you will see Freight Information in the bottom left. This will show the model number for each piece on the order, which is what you will use to find the matching assembly instructions. If there are multiple pieces, you can use the scroll bar within the Freight Information box to scroll down and see every different model included on the order.