I have an audacious plan. Naturally I can not return there, but you are unknown Jake. My second in charge is likely to now be taking the church service so you turn up and sit at the end of a pew close to the vestry. Then when the acting pastor calls everyone to prayer you sneak into the unlocked vestry which will be unlocked and retrieve the stash from the secret compartment. Only take items you can put in your pockets, then at end of the service you mix with the crowd as they leave.