I inspected today. I was expecting to see the egg frame I donated to have some queen cells started. All I saw were larvae. Looking around a bit more and I saw quite a bit of good brood cells being filled with honey. Hate to see them getting honey bound. I looked around some more, though, and found... eggs!!
I can now see the wisdom in jdpro's and Michael's posts being borne out here. When I found the pried-opened queen cell back on the 15th, assuming the queen had just emerged, that still left me 12 days +/- 5 to expect to see eggs. Here it is the 28th, and there they are!! I just wish I knew why I couldn't find her before.
I inspected the other stronger hive, hoping to find and mark the queen. By that time, though, it was getting close to sunset and they were awfully sting-y. Got four hits trying to pry out the first frame. So I gave them a puff, put the supers back on, and called it a day.
I think I'll go out tomorrow in early afternoon to try to find and mark both queens.