Yes, any type of bone injury would be visible even now, and IMO, head injuries enough to kill, would be too, there would be some cranial damage, MOO.
sometimes with a very hard sideways knock , there will be no actual skull fractures but shearing of the neural pathways (as seen in shaken baby syndrome) ...this causes a brain bleed and extreme swelling. usually when a brain is hit hard and brain hits the skull. It is enough to kill unfortunately , and will not show up if there is only skeltal remains.
I feel awful even writing this about William....
I know a lot about TBIs (too much ) as my son was hit by a van whist on a bike and suffered a massive hit to his head ...no helmet he was 13.
He spent weeks in the royal childrens hospital here in Melbourne, with 5 trauma teams looking after him.
Neuro informed me of all horror scenarios. We were lucky and now 5 years later I still have my beautiful son .
He broke his jaw in two places and smashed cheek bones ....also I was told by maxio fascial that in kids under 13 their bones don't break cleanly as an older teen or adults do. They break like green tree branches ....messy fibrous and hard to fix. the opposite of a clean snap.
Sorry a long post, and yes breaks would be visible if any occurred.
I'm not a Dr , but having spent solid weeks bedside , 24 hours 7 days ....and many many months at outpatient appts , I think I heard too much.