There have to be vacancy's for a "Vacancy Bid" hence the name. Has there been departures from the 747 FO side? I have not seen the sign's of a shortage.
2014-7 was a big award, with a 11 NH slots on the 747 and 21 on the 767. Could take more than a month to get thru those.
That being said, 2014-7 posted after midnight on the AM of the 16th, EDT.