Hello, thank you very much! <3
The last thing in the main store area is a continuation to another quest in the store collection, so you might want to check the items in your pockets again!
As for the top button, if you have all other collection items (minus these two you've just mentioned), that means you have done a similar action already for a different quest, from the same collection page as the top-button one!
Hope this helps, good luck!