That is such a shame. Sorry to hear about Bobbie's death.

Do you have the seller's information? Maybe they will work with you on a replacement if you want to work with them again.

In your first post you mentioned a yellow fluid/mucus coming out the mouth and cloaca/vent.
Red worms produce such a color toxin. I know you've answered some questions before with regards to the baby worms you purchased at Walmart but I think we need to look further at them.
Can you post a photo of the container the worms came in and a close-up, well lit photo of the worms? Maybe one or two of them placed on a white piece of paper.
I remember getting a shipment of night crawlers in from DMF Bait and finding a red worm in the mix.
You could also take one of the worms out and pinch it or possibly poke it with a sharp object to see if it produces the toxin.
Sorry to go on like this but I know you want answers and the retired deputy sheriff in me wants to investigate this incident.