Should I be concerned if the thank you note for the birthday presents only mentioned one of the two presents we gave to the child?

Recently my daughter attended a birthday party for a child who used to be in her school. I gave two dinosaur cartoon DVD’s and dinosaur pajamas. We just got a thank you note from the parents, and the note mentioned the DVD’s and not the pajamas.

Should I contact them and mention the pajamas? The way I was thinking I could do it is to contact them and let them know the PJ’s came from Costco,and I wanted to mention that if they don’t fit you can return them without a receipt. I am not sure if it would sound weird to do that, but I am kind of concerned that they don’t seem to realize that we gave them the pajamas, too.

I know when you have a party, it’s very easy to mix up who gave you what gift(s).