Since the treasure (which is totally not a gold monkey) historically belongs to Lana's people and she's helping Cyril steal it, unless Archer gets to it first, but then he risks his mother claiming it as hers since he'd have found it while working for her, maybe the idol is a metaphor for AJ, and comatose Archer is worrying that with him out of the picture Lana will get back with Cyril and he'll help raise her "treasure," or maybe his mother might try for custody.