For testing purposes, if you want to see the boxes selected for an order, the following steps should be followed:

1. Enable debug mode in the settings tab
2. Place the order from front end
Due to the debug option, we see 3 Code blocks on the front end(cart page/checkout page).

Package – This provides information about the items’ individual dimensions and the box dimension(if the custom box is selected).
UPS Request – This provides information regarding the request sent to UPS from our plugin which includes the box dimensions.
UPS Response – This provides information regarding the Response that has come from the UPS side.
By analyzing these 3 Code Blocks, we come to know about the boxes selected.

Let us take an example:
We have placed an order for 2 products that are packed inside a single box. The debug option was enabled and the following snapshots came up.

Package : This shows the dimensions of the 2 products marked by points 1 & 2 in the snapshot and also dimensions of the box in which packing will be done (marked by point 3 in the snapshot).

Package Dimensions

UPS Request :

This shows the request sent from plugin side total package as shown below :

UPS Request

UPS Response :

The Response that comes from the UPS side shows the total billable weight as shown in snapshot.

UPS Response

Botto figure out problems.