This is a quick fix idea or at least a temporary fix idea. My tumbler has four draw latches which keep the two door leaves securely closed. The have seen a great deal of use and one was damaged so that eventually the keeper tab over which the spring latch catches broke off.
This first image shown the undamaged keeper tab at the bottom left.
This drawing shows where the keeper broke off where it angles.
This is the 1/8" x 1/2" wedge driven into place.