On the mystery items: First thought is that they could be some type of implants for the spine or joints. Another thought, is that they might be metallurgical test samples, in which case the notches could have been made when a sparking test was performed with a grinder. Some of the markings seem like dates to me... If they were implants, there may have been multiple replacement procedures. If they were metallurgical samples, these dates would have served as a reference for when the testing was done or when the sample itself was taken.
On the mystery items:
First thought is that they could be some type of implants for the spine or joints.
Another thought, is that they might be metallurgical test samples, in which case the notches could have been made when a sparking test was performed with a grinder.
Some of the markings seem like dates to me...
If they were implants, there may have been multiple replacement procedures.
If they were metallurgical samples, these dates would have served as a reference for when the testing was done or when the sample itself was taken.
2:52 demonstrating a clear lack of understanding about how life works
The last item might be a second punch for small screw heads.