Nope, besides the fact he was bigger at 24 and not only that the place was locked from the inside initially so not even a hacksaw blade would have done the trick-----which hadn't been brought forward until over a month later, by the relatives---again.
No marks of force inside anywhere. No prints/ blood or clothing fibres found.
Not certain how it can be known, for sure, that everywhere was locked from the inside. Might it not be possible that, having checked one or two windows, and finding them locked, because they thought it was murder/suicide, they didn't bother to check them all?
How often, during those earlier entries, did he cause there to be marks of force? How much had he grown between the murders and 'breaking' a few weeks later, to retrieve documents?