Then There are challenges like this one.
What is this amazing thing, you ask? Well that is the 200 year old writing cabinet used by King Fredrick William II, among other famous and important personages. Filled with hidden compartments, secret springs and locked doors, what other things could you put in here? Gas-traps and poisoned needles for the unwary? And if what you need are documents inside it then any attempt to break the desk would result in those documents being dropped in a vial of acid, or otherwise destroyed. Perhaps this cabinet is an intricate lock used to keep a demon sealed away inside (like the Lament Configuration, except with a key), and to solve the riddle is to let the creature out.
There are a lot of different ways you could go with this. Or maybe you just want to give your players a flavorful bit of fun when they're being handed orders by the undersecretary of state for his Majesty's peace.