Yep, 100% agree. This is the best way. Letting it happen naturally will always result in the best patina.As other have said, do not treat them with anything, in the past I gave leather conditioner to my cases every 2 weeks/ monthly and it developed a bad patina, like “rotten” leather. Not visually pleasant. Since last year I let them develop the patina naturally and patina is richer, more pleasant.