I think a bit depends on how dry. I know more then a few years ago a fellow found a number of blanks in an attic out west (Nevada I think). The wood had literally baked until it became ultra brittle and developed large seasoning cracks for the heat. I think if it was stored in a normal environment that wouldn't be an issue. In itself, I don't believe your blank is too hard to work as long as its been stored correctly.

foxes rule