Einar finds no pressure plate. There doesn't seem to be an alarm or trap on the shelves themselves.
The wooden coffer has two drawers and a lid, both apparently secured by a single lock. Einar tries to pick the lock (d%, 69, FAIL) but it is too delicate even for his experienced hands. The party will need to find the key for it.
The pouch opens easily revealing 110 platinum pieces and a small, flawless ruby.
Actions?