Optimum humidity for pipe tobacco is much lower than the optimum storage humidity for cigars, thus as others have said boveda packs are largely unnecessary, unless the tin is open and you live in a desert. I normally open a tin ~1 week before I anticipate smoking it to let it dry out, some tins (notably SG) are left without a lid for several days.
I don't open tins simply to transfer to a mason jar or mylar bag, luckily I've not had a tin fail on me. Similarly I've not had any mold problems in any of storage methods mentioned. Tobacco that is in the rotation is kept in its tin, mason jar, or transferred to a bail jar like the one shown by
@craig61a.