It didn't take me too long to master the list, so they were put away. I found them about a month ago, and started showing them to Daniel. I had no idea how much he would love to look at these cards. When we aren't playing with the cards, they are kept in a drawer by his toy box. For the last few weeks, he will go over to the drawer, then whine and point until we take them out. When we open the drawer, he pulls out the cards. Every time.
He's really impressed us with his ability to learn, too, because we can put a few cards on the floor, and he can pick out which one we ask for, in either English or Dutch. He's right about 90% of the time!
He just pointed to the milk card. If you know ASL, you can see that he is signing "milk" as well.