The fact that they sprouted does not indicate they are truly viable seeds.
Most of my plants are started the same way, between layers of paper towels moistened with distilled water. The germination container is then kept on top of a seed mat and the seeds usually sprout in 2 - 3 days for this type of plant. Once the seeds have a rootlet around 1/2 inch they are placed into small pots that are filled with a sterilized soil mix and are covered with a thin layer of soil. The pots are kept on top of the seed mat until the plants break the surface and are then placed under lights.
In this case the 2 that did not survive did not even break the surface after a week. I started one of the BBs less than a week ago and it is already up and under the lights
As far as environmental conditions being the issue the Blueberry seed along with several other kinds of seeds that I started were up and happy within a couple of days under the same conditions as the WWs. Since these seeds never made it to a regular growing container the majority of the environmental questions are moot, but I will answer them anyway:
Seed Strain: White Widow
Type(Regular, Feminized, Autoflower): AF
Medium(soil, DWC, Coco): Custom organic blend
Size of container: 2"
Brand/type of nutrients/supplements: none
pH of water/solution before feeding: 6.8
pH of runoff in reservoir: no reservoir
EC or PPM of water/solution before feeding: not measured
EC or PPM of runoff in reservoir: no reservoir
Indoor or Outdoor grow: indoor
Light system(CFL, HID, LED): never made it to the lights
Light watts(If LED: actual watts, not advertised): never made it to the lights
Temperature(Day and Night): 71
Humidity(Day and Night): light misting daily
Total time of growth: 1 day
If flowering, total time of flowering: 0
Since the only seeds I have had an issue with are the WWs I am going to try one from the last pack of 5. If that one behaves the same I will just assume the remaining ones are not truly viable. If that is the case will accept my losses and not waste my time trying any additional.
Over the past couple of years I have purchased almost $600 worth of seeds from ILGM and have never had an issue like this.
I have been growing all kinds of plants organically for the past 45 years without issues so I think my methods are good.