Workers are Pulling out Dead Pupae!?

• I saw last night through the window that some bees were carrying white, underdeveloped pupae around the hive, eventually getting them outside and dropping them off.
• This morning, I see a pile of similar and "casing" looking stuff below the entrance:

• At lunch, the pile was generally the same, but I did see one or two bees fly off with white pupae in their legs and one inside the hive carrying a piece around.
• There is no bad smell to these, and I see no mites on them either.
• The thinking was:
• Chalkbrood, but no mummified/dark larvae, and only affect larvae.
• AFB or EFB, but no smell and that attacks at the larvae stage not pupae as I understand it
• Very hygienic bees, some are bred to purposely kill and clean out cells where there are mites.
• Chilled brood.  We've had a couple cold nights in a row and if they have expanded faster than they can cluster, the pupae on the periphery and get chilled and die.
• Max says to inspect, make sure there are eggs to verify a queen.  Not sure I want to break the hive apart to do this.  I will give it another day.  Temperatures are supposed to get warmer.
• I did just look into the hive on Friday and saw nothing out of the ordinary.  Saw the end of the brood nest with plenty of capped brood.
• I have to believe it is either hygienic bees or some got chilled since the stuff being dumped out is definitely pupae.