Jon's interviews is that he left the island with an idol, so it's not in their shared backpack.
which is dumb b/c if he wasn't going to play it, jacklyn should have been the one to hold it, she could give it to him to play when they felt threatened or if they mis-read it, he'd go home and she'd still have an idol, cuz once jeff asks the question to play an idol, there are no hand me downs allow or shit like that. reason she should have held it, is he's always the target, jacklyn is only a target if jon won immunity and they wanted to break them up, in which case then she can use the idol and save herself and they'd be double safe.
But no, he had to be the one in control of the idol and hold on to it, he couldn't ask his woman for the idol huh? "hunnie give me the idol, i think i need to play it"