I'd be astounded to learn that Radio Frequency sicnals would work on a load of METAL tools stored in a big, screening METAL toolbox.
Recently heard of a comuter Tech. had trouble with corrupted floppy-discs. Jumps in car one day, throws handful of discs on passenger seat, DING! the penny drops! Automatic heated seats= inductive elements...
place discs in a biscuit tin, no magnetic or RF disruption.
Shadow-boards /foam cutouts/ clip-rails is the way to go.