[mothered]

I thought about the object received wrong, okay?

The wrong Item received Is a universal method that's suited to almost every company that has an Inventory of stock, so you're good to go.

On the Amazon description, do I find the weight of the object, or of the object plus the packaging?

If you're claiming the wrong Item was In the box, obviously the Item weight Itself Is of relevance.

If It's the entire packaging (Item & box), then that pretty much speaks for Itself.