Quill Corporation via YouTubeIn the Quill.com commercial, everything that character touches turns into a Dunder Mifflin product. "The Office" may be closing up shop, but the Dunder Mifflin paper brand is hoping to stay in business. The sitcom's fictional paper product company became a real brand in 2011, thanks to a deal between NBC and Quill.com, a subsidiary of Staples Inc. RELATED: 'THE OFFICE' ENDS UNLIKELY LONG RUN Quill has since expanded Dunder Mifflin from a copy paper vendor into a powerhouse of pop cultural stationery products, hawking everything from markers to sticky notes with an "Office" twist. NBC/Chris Haston/NBC'The Office' airs its final episode Thursday night on 'NBC.' During Thursday's series finale, Dunder Mifflin will air a whimsical ad spot promoting the brand on NBC. But not every market will get to see the commercial on their TV set - only viewers in Scranton, Utica, Akron, Albany, and Syracuse, the ...