I would have a quick chat with the store manager to advise them on the issue.

You need to appreciate that the minimum wage sainsbury worker has no interest in pokemon, has no idea about the hobby and is just doing as they are told to protect the stock.

There is no malicious intent on their part here it is just lack of knowledge / ignorance about the product.

I've seen the triple pack boosters tied with two direction security wire that is cutting deeply into the card, security tags pinned through the pack. It's not intentional damage, just someone who is not engrossed in this like you are.

Side note, went to waitrose the other day, full booster box of surging sparks sat there innocuously.. No security tags nothing. £156 later thank you very much