In an effort to ensure jobsite safety and to prevent premature removal of the lids, is there any good way to [temporarily] lock-in-place your safety lids?
Simply place 2-3 long wood screws in the joint between the grey and the orange plastic parts. The wood screws will self-drill with minimal downward pressure, the 2-3 length will enable the wood screw to pass completely through the ledge, which is an integral component of the grey PFI. To increase the odds of preventing removal that is unauthorized, consider using square drive or drive choices which discourage the use of an ordinary screwdriver.