I've never done mail-order chicks. BUt I agree people do it everyday.
Hard to blame the complete failure on mail-order. Especially as you have
chicks from two different sources.
Everything else sounds fairly normal.
Plastic tote, source of heat in acceptable range. Pine shaving...seems as if
I read somewhere as if newspaper was not the best floor, but I've always
used it with no loss. No colored or slick paper. Correct food.
So...chemical or air?
No heavy odor in the area? Perfume, bleach...? Clean air?
Water next. If it was a new waterer, surely you washed it before use?
Quality of water? Any chemicals in your water supply?
Same question as to the feeder. Was it new? You washed it? In what?
My guess would be with chemical. But...just a guess.
ME? My choice has been with a new cardboard box bought just for that purpose.
Shredded newspaper for flooring the first two-three weeks. (I feel the cardboard
and newspaper provide a better, softer footing than the plastic totes. Feeder and
water dishes are hand washed in the kitchen, well rinsed, dried with paper towels.
Food is chick starter, and our county water is pretty good, but I do have a in line filter.
Again, my guess leans toward a chemical. Doesn't take much.
I'd clean everything and try again. Sounds like you tried to do everything right. Don't
feel bad. It happens once in a while.
**I'll edit to remind you to always wash your hands before and after handling the
chicks. Could easily be something on your hands transfer. Same with cigarette smoke...
I wont' smoke near them. (Think I'm picky about my chicks, you should of seen me with
with my baby daughter. She's ten now, and I'm STILL over-protective.)