TBF we do know a ton have left over the crafting because of how many came here to say they were leaving over the crafting which can be extrapolated to many many more who didn’t bother to come here and say.
Now, I don’t recall what the usual number to calculate is on how many hundred people’s feelings are represented by each person who actually takes the time to say something, but I think it was about 500.
Now, if I remember right, that was what congress assumed would vote according to each letter they got when I was a kid. As such, if we guess the 512 in the memorial represent about 256,000 people’s feelings over crafting… we aren’t going to be far wrong.