That works if the INM agent you deal with has watched the video. In my case 11 days ago the agent told me to fill in the bottom half only, I did so handed it back to him, he stamped it, I think he signed it, handed it back to me, but didn't give me the top half, as this was my first time flying out (I usually drive) I didn't know any better. Is it a big deal if you don't get the top half back, can't you just get a new one on the plane when you return....?