Forum Academy Marketplace Showcase Pricing Features

Need to check if a item in someones cart has customization

So I have a cart system for a store and when it comes to checkout I want to show a box if an item in the users cart contains customizations as a feature now we set the products with these in the Database but I am struggling to work out how to set it so when the person has a product with that option in there cart how I can show the box as when I do Current Users, cart, products, custom, is yes it says it does not work how can I do this?
Thanks!