How many dead bees is too many?

[Fannbee]

We just bought 2 hives, moved them about 1.5 weeks ago. We bought 2 full brood boxes, each with a queen, that had 10 full frames and were ready for expansion. One is stronger than the other and seems to be doing well. We added a shallow honey super as our foundation for the brood boxes we bought has not come in. We thought something was better than nothing.
We inspected, didn't see eggs in either box but we are newbies and I still have problems seeing the ones in the pictures with the arrow pointing to them. I do see capped brood and larvae in both, even saw a bee emerging from a cell. My husband saw a queen cell in the middle of a frame on the weaker hive, but I had seen larvae 3 days before.  
There are significantly more dead bees outside the weaker hive than the stronger hive. Ages are varied - some seem younger to me as they are fluffier and lighter colored(we have russians), but the majority are darker and bigger. They do not appear malformed, we can't find mites on them. There are some holes in 1-2 of the frames but they are on the edge and the bees seem to use them to move around. They are pretty packed in there - this is why we added the shallow super rather than wait.  We have worked them twice and want to wait for the weekend before we work them again.
Both hives have a lot of activity with a lot of pollen being brought in in the am and evening, lots and lots of activity from both hives in the early evening (orientation flights?).
Why would the smaller hive have more dead bees? How many dead bees on the ground outside a hive is normal?

[Brian D. Bray]

Out of the night when the full moon is bright comes the horseman known as Zorro...

Robber bees, it is possible the stronger hive is robbing your weaker one which is why all the dead bees which is why the dead bees seem to be of varying ages.  The bees within the hive that finds the robber tries to stop it where it's found.  sometimes the robber has already survived several attacks.  The dead bees are both the defender and the robber bees.

Try putting on a robber screen and see if that doesn't alleviate most of the problem.