Grit vs no grit

Will it be fairly obvious if they are not getting enough Grit? I bought 3 10 week old Wyandottes that were kept caged up, no idea what they were being fed, but I have them free ranging and also chick crumb on 5m x 5m of rough grass with some sand, and the walls are granite so plenty of natural grit, but I never see them obviously picking it up. They eat a lot of greenery, (I worry - too much) but they love it so I am guessing what comes naturally must be good for them? But back to the original point, how would I know that they are getting enough?
 

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