>>>Do we really know the grave site of Tziporrah, Yitro. Aharon Hakohen, Yehoshua?
Explicit posuk that Ahron was buried in Har Hahor in what is now Jordan. Where in Jordan is Har Hahor is not clearly known but the MUSLIM tradition that he was buried where he is believed to by some to have been buried is over 700 years old.
The posuk says that Yehoshua was buried in Timnath-serach but it is unclear where that city is today, let alone where in the city Yehoshua was buried