How to play?

This is slightly similar to Zork. OK what to do? There will be a scenario (which i will choose :P) you have to find a way to beat the game, the users below will have to find a fault with the user's above method to solve the challenge for example if the scenario was to open a chest full of gold and i say "open chest" and user below will have to say something like "chest locked" once a user below has done this they have to find their own way to open the chest. the player is not limited to verb-noun commands, such as "open chest", u can also use sophisticated sentences such as "pick up the chest" and u can also use simple verbs like "open"

ok enough explaining xD lets start

Scenario: you are in an abandoned graveyard all the graves have re-surfaced whilst observing this mind-blowing phenomena you set your eyes to the biggest coffin in graveyard which had gold embedded in the crest suggesting the dead person could be a noble, the coffin also had a warning engraved onto saying "do not open" you also notice there is a unopened letter behind the coffin laying on the blank gravestone, what do you do?