I cannot beleive that is possible for many reasons. First and foremost being, if he were found weeks ago and they were waiting on DNA - thre is no way in heck that could be kept under wraps this long. At the very least they would have given Desiree and Kaine a heads up. Based on Desiree's comments, I think that is unlikely. Secondly, if remains had been found I don't think it likely they would be waiting for DNA to perform a more thourough search of the area. If ANY human remains had been found, I don't see them waiting six weeks to go back and search for evidence. That just doesn't follow to me.
ETA Just reread your post and now realize I misunderstood. You meant that you think they found evidence weeks ago and are now revisiting the sites. Possible, but I thought one of the MSM sources qouted the LE spokesperson as saying these were not areas that had been searched previously.