Just found this thread.
I'm on day 19 of my first ever batch of shipped eggs. 12 Standard Cornish and 11 BCM. I bought a single araucauna egg locally as my "control" (really wanted a handful but that was all they had).
I have lost a ton of the SC along the way. I think there are only 2 that are realistically going to hatch. I removed 4 of them yesterday going into lock down that were totally clear. I elected to leave a bunch of "prob not going to hatch" eggs in there as well. The Marans are faring better... maybe 6 that will hatch. The lonely blue egg looks the best... I'm almost certain its going to pip first.
The only boneheaded thing I did was that I didn't have the sense to mark the eggs when I candled them yesterday. Going to do it again tonight and mark them so I know which ones I'm expecting to do well, unless someone has already pipped. Also, I know I have a saddle air cell that I need to keep an eye on... shame on me for not remembering to mark them all yesterday!
Shipped eggs are tough. Stinks because down here in Oz there are a really limited number of breeds unless you buy shipped eggs. Maybe I'll get lucky. I just hope I get some pullets out of this!
Good luck to you all, hopefully we will all have some chooks by this weekend!