Charities that accept office supplies

My family has recently moved into what used to be an office. We have been holding basically all the office supplies still here because we do not want to just dump it. A lot of other misc. stuff we have taken to a Goodwill nearby but I wanted to know if there are any organizations that specialize in office goods donations. I'm talking folders, pens, organizational shelves/baskets, etc. All suggestions are greatly appreciated.