Assuming you are talking about a box that contains the original tablets on which God wrote the Ten Commandments, maybe the Jews do not believe that this is the case. Although, it would be interesting to analyse the original tablets to see what language was used and whether they were finely written and the imprint of the Finger of God left.
The Jews do not seem to be very interested in artifacts at Jabal al Lawz, either. The evidence of the Red Sea Crossing of the Exodus from Egypt and the Mountain of God is overwhelming from an archaeological perspective. Likewise there is a lack of interest when it comes to the Noah’s Ark site in Turkey.
What this means is that their may be another agenda that has a priority. The nation of Israel consists of people who are atheists, Zionists and homosexuals, on one side of the spectrum, and religious orthodox Jews, who uphold the Torah, on the other side of the spectrum, and are opposed to those on the left.