You're right, Green Day has a huge singles/CD Promo collection. However, from 2016 there are just a few (comparing to the 90s, when you can have 2 or 3 versions of a single... or even more). The Live Eps are memorable, too (Also, considering almost all of them were japanese exclusives... it gives a real feel of satisfaction when you get them in physical). Not all of them have a good art work, but the content (music) is fantastic!!
It's a shame that EPs or the vast majority of singles are not available in Stream services.