In Jeremiah 3:16-17 it says that the Ark would not be thought of or missed nor would another be made. It would be replaced by the Lord's presence. We dont need the original Ark because Jesus fulfilled the laws and prophets. He replaced all ten commandments with 2... Love God Love fellow man
The ark remains lost to all but God. Interesting theories like the ones presented above continue to be offered, but the ark has yet to be found. We may not find out what happened to the lost Ark of the Covenant until the Lord Himself returns.