As I said in my details, its a matter of precidence.
If someone doesnt have a deed but can show they have lived in a home they were born in... AND the only person who can show a deed shows it **after** this person was kicked out. AND that deed was not legally signed and transfered from the original owner, then the deed is invalid.
Only way the jews could create a deed to a plot of land and have it be valid in this scenario is if no one can show they had stewardship over the land before them (or explicit ownership).
In other words, if I am born to a plot of land that no one owned, and built a home on it and cared for it, especially across multiple generations, then you would effectively be considered the owner. Only way to invalidate that is to show an owner existed before you.