You will need to message me. It's always best to ask first.
I do not include a packing slip in the package, the tracking info and my return address is enough to determine where the package came from. If there is a valid issue, all you have to do is contact me, which is extremely easy. I have my own process and have been doing it for many years, so it's unlikely I will change. With the small amount of spare time I have, it's the best I can do.
Please feel free to message if you have any other questions or concerns.