Well, can you post more detailed pics of the vent holes and liner?
It seems to be M35 model, not M40. But it is hard to say because pictures are not too good. $200 is not too much but it is not a bargin price either.
I personally do not care much about these numbers if the helmet shell itself is OK. Not all were marked. But better pictures is a must. If seller does not want to send better pictures, better do not buy it.