Lost Queens!

I thought things were going well but I've just finished going through my hives and I found that I have lost queens in three of them; once again after treating with MAQS. I'm more than convinced this isn't coincidental!

Both my home hives have few bees and very little brood in them. I'm in a similar situation at the Gardens. The only curiosity us the mature hive in Ladue. 

This had MAQS treatment and afterwards a high residual mite count and quite a few SHB larvae crawling on the sticky board. I went in today to find a pretty healthy hive, I saw the queen and she's laying to a good brood pattern. I think the SHB may be hiding under the screen bottom board and above the sticky board; there weren't many, if any, SHB in the hive that I could see. I put another sticky board tonight just in case the count was weird. I'll pull this on Friday.

So now I need to find queens! I hope I'm not too late!