Mold in the shop question

My garage is everything. It's my workshop, it's my bodyshop, it's my service bay, at times we clear everything out of the way and jam in it, and I park my cars in it. It's like yours - insulated, heated when I'm out there, on a concrete slab. I'm in Central NY, and we get humid enough weather here. I've had all kinds of wood, books, manuals, etc. in my garage for years - a decade. No mold of any kind. Some mouse turds from time to time, but no mold.

That matches with my experience in a shop in a garage in New Jersey, Pennsylvania, and now slower lower Delaware. I did put the books, etc., in a cabinet just to keep dirt from settling on them. No mold problems either. We are about 3 miles from the Atlantic Ocean here, so tools do have a good wipe-down of oil, as they can/will rust here.