Hmm. Not sure I liked the performance.
Wasn't a fan of the reasoning for just "going to try and find a few of the cards that could be yours." I feel there could be better patter/ presentation here.
What is the motivation for giving the spectator half of the deck to hold onto? The reason for doing that usually is because there is no table handy to set the cards down on, but in the case where you do have a table, you need another reason. In addition, you had all 5 cards separated from the pack, therefore giving the entire deck to hold onto makes more sense. Being given only half of the pack is odd. This is why it would be better to, as you are searching for the five cards that could be his, after you outjog the last card, give the spectator the remaining cards below that card to hold onto. You can also, before you take out five, say, "well, I am pretty sure your card is somewhere in this half, so go ahead and take these" (hand them half the deck). Then you take out the five cards.
Lastly, you didn't really sell or emphasize the, "your card is now gone," and you didn't even ask if they saw their card within the five that you chose.
The handling of the cards was smooth and there was definitely confidence in the way you use the pasteboards, but the presentation was really off in my honest opinion. Hopefully some of the ideas I have given will help.