For some years now, not eating chametz that was sold to a גוי has become a very popular chumra. As I pointed out a few years ago (Not eating chametz that was sold to a גוי - Is it possible? and Not eating chametz that was sold to a גוי - Is it possible? Part 2) this is practically impossible, however, it hasn't stopped anyone or kept the the stores from pushing it. Here is a picture from Osher Ad in Bnei Brak.
The store sign clearly states that the crackers were backed after Pesach this year, however, if you read the red sticker it tells a very different story. The crackers were actually baked after Pesach LAST YEAR. The fact is that there is no way in the world that the stores could be flooded with products baked after Pesach a day or 2 after Pesach. It is logistically impossible which means that a whole lot of people are lying to sell more cookies.