Is the any ready made flip-flop gizmo to show if a hinged lid has been opened?
My outdoor parcel dropbox doesn't have an indicator to show if anything has been put inside and it's a chore to unlock it every time you want to check.
I can use a piece of sticky tape postioned so it gets moved or broken when the hinged lid is opened. Alternatively I could perch something on top of the lid which falls to the ground when the lid is opened. However something more permanent would be better.
Perhaps there's some gizmo to show if a drawer or door has been opened which can be reset.