I agree with the guys above, The big issues were the card being the wrong way round, the 'paintbrush' style slide down the box makes it look like you could just be sliding it behind the tape.
Have a look through the bound manuscript again and try one or 2 of the other variations.
More than anything, like the guys said before, really try and make your magic 'follow-able.' I'm sure you understand what's going on, but doing a silent performance warrants a performance designed to be done silent, it was as if you just cut out the patter.
Once you get the tips down everyone has given, I'm sure you'll have an awesome performance of the effect to show
D.