The Rye Field Model "Tunisian Tiger" kit contains 2 turret bins. One of them is intended for future kits, and is not for use with this kit.
The instructions tell you to use the other bin. It has two latches, shown here. Later, the instructions show Tiger "141" as the canonical example of decal application and painting.
This is unfortunate because Tiger "141" is the only Tiger in this battalion whose turret bin is not provided in the kit. Tiger "141" had a bin with four latches, which was visibly taller than the kit's bin.