Returning products from two different orders is easy and straightforward.
Simply create two (or more) return cases, one for each order number.
Here's how: https://support.shapingnewtomorrow.com/hc/en-us/articles/360031343572-How-do-I-apply-for-a-refund
Then you simply put all the products in a box and enclose the return form from both orders.
After that simply use just ONE return label and put on the outside of the package.
Then you hand in the package and we will do the rest.
If you choose to do the above, remember that only the return label you choose to use can be tracked.