I'll put a heap on many of them being beech. Can't be sure that they all are but I think that many of them are. Reason, twofold, sycamore doesn't normal splat with such clearly defined lines, it can be more of a blur or much thicker lines. I think that I can also pick out the fleck on some of the blanks that is typical of beech.
But then again, I could be wrong! Frequently am.