>> Precedent subsequent to the statute's original enactment in 1887 has been sparse. There appears only to have been one example [], in 1961, when the Governor of the State of Hawaii first certified the electors of Vice President Nixon as having been appointed, and then, due to a subsequent recount which determined that Senator Kennedy had won the Hawaii vote, certified Senator Kennedy as the winner. Both slates of electors had met on the prescribed day in December, cast their votes for President and Vice President, and transmitted them according to the federal statute. This was the case even though the recount was apparently not completed until a later date, that is, not until December 28 (Facts on File, Weekly World News Digest, Vol. XX, No. 1052, p. 469 (December 2228, 1960)). The presiding officer, that is, the President of the Senate, Vice President Nixon, suggested "without the intent of establishing a precedent" that the latter and more recent certification of Senator Kennedy be accepted so as "not to delay the further count of electoral votes." This was agreed to by unanimous consent. (See discussion in Deschler's Precedents, at vol.3, Ch. 10, § 3.5, pp. 1213).
May indicate that it would behoove us to get the questionable states to certify an alternate slate of electors on the proper date, whether recounts have finished or not.
http://www.house.gov/cha/electoralcollege/electoralcollege.html