I have the book of pictures that Days put out a couple years ago. You are right Muzzaman, from all the pics of the "stored stuff" Days really does have tons and tons of sets and decorations for them. Shelves full. Clothes, jewelry, shoes, rings. glassware, linens, draperies, dishes, walls, doors, windows, vases, flowers, paintings, candles, sconces, tables, chairs, etc. etc. On the front of the book is a pic of the Bo/Hope Brady livingroom, showing a doorway, and beyond that, a dining room, table, chandelier, etc. etc. I have never ever seen that dining room, but perhaps someone remembers doing so. I have shown and asked a few long time Days watchers, Nope, never.
Now they MAY have sold off some items, that is possible. But I do know that a lot of crew has been laid off, and what matters is time to put a set up, take it down. (I did not see any "pier" pics in the book, but will look again. lol) With fewer crew, this is why they will use a set for long periods of time. Like currently it is Club TBD, Pub, and of course The square, which is never taken down. With fewer sets, they don't have to worry about decorations either for holidays or seasons, like they used to do with the apartment and house doors...wreaths, etc.
but, Jason47 would probably have more insight on this than I do.