@nursedi71 Throw them away. I would not run the risk of even feeding something like this once (for context, my dogs are fresh fed and eat bones several times a week).
Weight bearing bones like femurs are too hard and can cause tooth fractures.
Dehydrated bones are more likely to splinter.
Bones should always be fed raw, never be from a weight bearing part of the animal and be of an appropriate size for the dog and their chewing style.