Re: requeen failure
Cfalls, my best guess is you waited too long to introduce the caged queen. It needs to be done in under 24 hours or the bees will select larvae and start their own at which point they will not accept the queen you provide them. Unless of course, you do like Dan and make them hopelessly queenless by waiting a week and then destroying any queen cells you find. I do not think the cells you have now are bad queens from old larvae. Consider, you removed the queens on the 19th. They were laying eggs until then. Three and a half days for the eggs to hatch brings you to the 23rd. Add five more days for the cells to be capped and now we are at the 28th. You inspected on the 29th and found capped cells. That is what I would expect to find.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.