I have established in my question How did the Ministry protect against the use of unauthorized portkeys? (at least in my mind) that it is extremely difficult to make and use a portkey not previously authorized by the Ministry of Magic (and not get caught). This is based on the quote, "Its more than our life's worth to set up an unauthorized portkey" stated by Lupin with the entire advanced guard present.
Since that is the case, who on earth made the portkeys that were used after the battle of the seven potters in the final book? or, if the portkeys were authorized, who gave the okay?
Of course, I am assuming they were trying to keep Harry's movement at least, not obvious, because the Ministry had been infiltrated to some degree by Death Eaters.
Use, or planned use of portkeys listed on pgs. 66 through 69, where it specifies all the "Potters" and their escorts are returning to the burrow through use of Portkeys.