I normally purchase them straight off and store them. In doing so, I've never had to place the items on my board for them to count. The goal just flashes up quickly with the tasks auto completed before vanishing. Of course, we must always keep in mind that no goal ever runs totally smoothly so exceptions are bound to occur and there's always the possibility that S8 could change the rules at some point, lol.
Okidoki! Thanks a lot for information!! I usually store them right away too. I'll try this method from now on