About 10 years back, I was out raking the walnuts up when a lady pulled in the drive.
She asked if she could come back with her husband and pick them all up and take them home.
I asked why? She said they have a gravel driveway and they dump them on it and drive on them all winter. In the spring, the meat is all gone leaving just the nut. They pick up the nuts and crack them open to eat.
They picked up about 10 wheelbarrows worth....they never came back in the following years.