Well, if you answer that you wouldn't return it I do believe you,
If you answer that you would be scared to keep it for any reason I would also believe you,
BUT if you say that you would return it cause that's the right thing to do ummm.. maybe while not being at it you think you would do so but when you're "at it" you might somehow find 1.5 million excuses why not to return it,
If you'll actually do it then I'll believe you.