In the cold open of Season 9's episode Customer Loyalty, Dwight is cleaning out some "dead files" and discovers a letter from Robert Dunder which describes a "valuable item" that he has hidden somewhere on the property. One of the files that Dwight mentions is for Scranton Mimeograph Corp. and the fact that he doesn't think they are doing business with them any time soon. This could mean the company went out of business at some point.
Dunderpedia: The Office Wiki