Thanks for all the replies....
There's no cedar in these shavings I got from my local woodworkers shop.
The reason Im suspecting the slivers is that ALL of my 6 girls were doing great from now til about 3-4 weeks of age,
but as they are getting bigger they are really eating heavily and after the first 2 died a couple days apart from each other they died right next to the feeder.
So I put their feeder on a large cafeteria type tray and all seemed good...but when I checked on them late afternoon yesterday I found another one died probably scratching for food right next to the tray as the feeder was quite empty and I was planning to refill for afternoon feeding.
All these birds had been thriving and been strong just minutes before...they just upped and died next to the feeder, hence I believe it is from choking to death on small slivers of wood as there are sharp slivers in this batch of wood shavings/dust...somewhat a medium coarse mix.
I've never imagined these chicks would have the potential to choke on this stuff...for now Im going to remove all this material and put them on newspaper and order some wood shavings made for pets on AMAZON.
This has been a tough lesson learned and thought I'd ask if anyone else has experienced this before.
There is no toxic wood such as cedar or walnut shavings in this material as I asked the woodworker.
Im super bummed at the moment...thanks for your folks help much appreciated