It could be a towel. There might be a matching one in George and Cindy’s house.
I remember watching a show about a case where the child was found stuffed in a black trash bag in an outside garbage. The investigators found when the bag was examined microscopically, the production ridges on the roll from the bags still in the house matched the ridges on the bag with the child.
The mother was convicted.
it could be duct tape, or the type of plastic bag, or maybe a receipt from one of the many, many, many stores precious Casey was allowed to spend her stolen money in......