when using booty keys either use them to create prom lasers or bot right at the edge of of maps if there is 2 or more booty boxes pick up 2 of them, look for the boxes in the most strange places, and scroll out with your mouse to make your map view bigger that was you will see them better i have found a ton of lf4's that way done like 6 accounts when they done the voucher codes free 60booty keys and got loads of lf4