A hot garage in Indiana is also likely a humid garage. I agree highly unlikely this is "dry". It may have lost some moisture, but as you state, a meter is the best way to know what moisture content is in the slab.Is it possible for a slab of cherry 2 3/8" thick to air dry in one year?
I can't imagine that, not in a climate other than a desert. Guy claims it was in a hot garage in Indiana and that its plenty dry to work with.
Whats reality without a meter?