Abijam’s dedications were made after his victory over Jeroboam, and probably consisted of a portion of the spoils which were the fruit of the battle 2 Chronicles 13:16-19.
Asa’s dedications may have been made from the spoils of Zerah the Ethiopian, who attacked him in his eleventh year (2 Chronicles 14:9, etc.). They were not deposited in the temple until his fifteenth year 2 Chronicles 15:10, 2 Chronicles 15:18.