Both idols should now be back in circulation. From the post-Ep6 preview, it looks like Russell is back on the hunt again. No sign that the Heroes have caught on, but hunting for idols doesn't involve shoving people off of platforms, so it may be beyond their skill set.

    About the remaining idols to be found, SurvivorsUnite says there are four hidden idols found during the game, and all are played to take a player out.  survivrcuz begs to (slightly) differ, stating "more than 4 idols will be played and only one by the heroes the rest all villains, each time one is used it goes back in to play."
    Time will tell who is more accurate, but presumably someone, or multiple someones, should be busy finding idols at this point. Doesn't sound like any more are played until the merged tribe phase, however.