OK, just done a quick checking inspection, to see if there's really eggs and larvae or not in those brood frames.
Yes, there are!
I could hardly see the tiny little things, right at the bottom of the dark cells. Even when the sun shone on the frame for a few seconds, and I angled the frame about to try and see to the bottom, I almost gave up looking - they're tiny!
Anyway, assuming I haven't chilled or irradiated the poor things too much, the queen was definitely there recently.
I saw the head of a worker, half out of its capped cell, so there should soon be more room to lay in.
All's looking good.
FG