“This is the reason the Ark was never in the 2nd temple and the reason it no longer exists”
This is completely erroneous according to Judaism. So we can agree to disagree. I guess, to be scriptural, one must find the text that talks of the destruction (G-d forbid) of the Ark. The premise here is that it is buried beneath the Temple Mount.
RDB— That is not in the Jewish canon...
JPS: Jer 3:16 And it shall come to pass, when ye are multiplied and increased in the land, in those days, saith the LORD, they shall say no more: The ark of the covenant of the LORD; neither shall it come to mind; neither shall they make mention of it; neither shall they miss it; neither shall it (be made) (asah) any more.
If something still exists, it would need to be made again now would it?