Does the secret of Rennes-le-Château lay in a presbytery?

Daily Grail points to an excellent essay on the presbytery, which sheltered Saunière on his arrival at Rennes-le-Château. Fans of Dan Brown's The DaVinci Code should follow the link.

At the time of the French Revolution, it is the home of Bigou, who is alleged to have hidden inside the church various relics, hoping that they will not be stolen, when he flees to Spain. Question: why did Bigou hide his items in the church? Why not the presbytery? Churches must have been more likely raided and plundered than the presbytery, specifically one as abysmal as that of Rennes-le-Château. And if, as we are led to believe, the secret had to do with priests, would priests not more likely find it in the presbytery, rather than in the church? And if it required discretion on the priest’s part, than a location inside the presbytery would be ideal…