Being that Dunkin Donuts is run by Nochrim, I have even procured Donuts on Motzei Pesach, as clearly the donut was in ownership of Nochri during time of Pesach.
Interestingly, they will not sell to you “Bichdei SheYaase”, as is true for Motzei Shabbos as well. I have heard stories to that effect, where the non jewish counterperson at DD in the 5T has refused to sell to an Yarmulka wearer right after Shabbos. (I think it is 20 min.)
I guess the Vaad there does a good job.