Not sure how many of you already got to it, but if not eventually you will get a quest to charge the collection. You explore the kitchen to do it and the items from the collection are in the drop list. So I explored about 15-20 times in a row and got enough drops to charge the collection. So I did because I wanted to see what the turkey does (170 energy), but once I completed the quest the items were no longer in the drop list! Now I wish I had explored more to get duplicates before charging the collection, so just a warning if you want to do the same. That said the turkey said something about being good for the Christmas quest (it starts earlier and earlier every year...) so likely even if they disappear for now they will be back later.