Re: 1st September-what to do?
Yes, you need to check that bottom box. For all you know it is empty comb with a little pollen, which is very common if you have not been rotating boxes. If all you have honeywise is one 8 frame deep that is not even full yet, harvest the one capped frame for a sample and leave the rest for the bees. You may actually be a little light right now but I am not familiar with your flows. Consider feeding. If the bottom box is empty or largely so, rotate it up, you want the bees to stay low and utilize all available comb space for storage and winter bee raising. Just an opinion from much farther south.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.