1 Kings 14:25–26 KJV  ...  25  And it came to pass in the fifth
year of king Rehoboam, that Shishak king of Egypt came up against
Jerusalem:
   26And he took away the treasures of the house of the LORD, and the
treasures of the king's house; he even took away all: and he took away
all the shields of gold which Solomon had made.
             This probably occurred in the summer of 925 B.C.
So, no one is going to be finding any of Solomon's treasure. There is
a story that the Ark was spirited out of the country during the days
of the Queen of Sheeba, and replaced with a replica because of the
growing apostasy in Judah.

Maranatha,   Lewis