Customer service monkey here.
I have seen some s##t.
Usually if a company requires verification of your RMA it's because it gives them an excuse to not ship you the replacement product if they can't get in contact with you.
They figure that if it's enough work for you to get the replacement product eventually you'll give up.
I have seen companies do shady things like:
Intentionally deliver products to the wrong address so they'll be returned, sometimes multiple times.
Intentionally send a broken product as a replacement, multiple times.
Take a broken product out of your return box, put it into a new box and ship it right back to you without even testing it.
Intentionally damage a product and send it to you so you'll have to return it again.
Receive your return item and let it sit on a shelf for months hoping you'll give up on getting a replacement.