I always put my return address on the package and for good measure drop my business card (most will use their own return address) INSIDE the package.

This is not a new idea to insure there is a way to find out who this is to be returned to if the package marking is damaged.

As to the tracking number, I've never heard of that being given out by the maker unless they shipped it to me. If I'm shipping I have to pay a little to get tracking.

All this sounds like you don't ship things often.