The claim about a "40 year old proofing box" changing how proof times work is a bit off. What actually happens with old boxes is the wood soaks up years of moisture and yeast, so it holds heat and humidity way better than a new one. That steady warmth is what makes dough proof more even, not the age itself. A brand new box kept at the same temp and humidity would do the same thing. The age just means it's already broken in and holds conditions steady without you fighting it.