[PeterPrinciple]

the Holy of Holies in the Second Temple was empty.

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1) and revealed to the public when God tore the curtain from top to bottom. But quickly covered up by the leaders.

2) Where is it? If you believe God:

Rev_11:19 Then, in heaven, the Temple of God was opened and the Ark of His covenant could be seen inside the Temple. Lightning flashed, thunder crashed and roared, and there was an earthquake and a terrible hailstorm.

[Campion]

and revealed to the public when God tore the curtain from top to bottom. But quickly covered up by the leaders

Everybody knew already that the Ark was not in the Second Temple; it didn't need to be "revealed".

Then, in heaven, the Temple of God was opened and the Ark of His covenant could be seen inside the Temple

That's not the Ark of the Old Covenant, but the Ark of the New Covenant.