Have to wonder if this is true as they said the only papers he signed was the official nomination papers for his nominees as the Senate was voting on two of them today. He also signed an Executive order requesting his family receive Secret Service protection right after he was swore in. Which they say all Presidents do as soon as they can.
Then when he went to White House after the parade, they said he was signing the papers for Mattis and Kelly to be sworn in as Sec of Defense and Director of Homeland Security, which they were by Vice President Pence They said all other business was going to wait until Monday after he and the family took the weekend off. Might have happened but I don't remember them mentioning about anything else being signed.