When King Solomon finished building the Lord's house and the ark of the Covenant was bought up, It states in 1Kings 8:9 ......that there was nothing in the ark except the two tables of stone which Moses put there at Horeb.

Where did Aaron's staff that budded go?

Or have I simply missed something?

Aarons rod and a pot of manna.

Hebrews 9:
3 And after the second veil, the tabernacle which is called the Holiest of all;
4 Which had the golden censer, and the ark of the covenant overlaid round about with gold, wherein was the golden pot that had manna, and Aaron's rod that budded, and the tables of the covenant;