Here is the pertinent subsection of US code 3 chapter 1 section 19
In reading this it is clear that the President elect and Vice President elect need to "qualify." Now we can argue that this chapter does not spesifically spell out a process to "show us your papers" but then again the Constitution does state that only an NBC can qualify.
From what I can determine Congress has not followed this chapter to it's proper conclusion for some time and to do so now would not only embarrass Congress it would of seemed to be "racist" to all of sudden ask for "papers."
SR511 was purely political and only drew attention away from the real issue of Zippo's qualifications.
Of course, Congress has failed to follow through. Their excuse is to laugh at We, the People with the excuse that no one wants Biden as POTUS thinking that will shut us up. It has.
SR 511 shows precedence, Congressional powers and bias for the usurper. It also shows the Congressional Branch knows and understands the definition of NBC.