Definitely the walking was a poor choice, had to watch this four times just to understand what was happening. This looks really similar to another trick I've seen .... can't think of the name or performer for the life of me, although I did see Jason England do a similar packet trick except in the end all four cards were revealed to be aces. Looks interesting, although I'd be hesitant to name it and take it as your own because I've definitely seen this somewhere (will look around and report back when I find it)
Really nice handling though, well done performance.