I agree with The15thMember on all counts, except the possibility of a new queen, and I would have agreed on that, except I learned from Iddee that a new queen will lay on the bottom of the cells, while laying workers lay on the sides. Even though a new queen may lay multiple eggs, these eggs will be on the bottom of the cells. There may be exceptions? Reagan may have hit the nail on the head to the mystery, the queen might have been laying which would explain brood of all stages, but then superseded or eliminated with the use of formic pro. There seems to be a consensus on the subject of queens and queen loss, being a sometimes problem of supersedure or queen elimination, when using formic and or formic pro; 'if not administered under' 'just right' conditions? Does this sound logical?