See attached photo’s. Bought a sheet of made in USA red oak plywood, What I thought was a mark on surface turns out to be a joint in  one of the plys causing a ridge. Fearful if I sand it out I may go thru veneer. Sheet was cut up by Lumber Yard on their panelsaw to fit in my vehicle. Three questions:

1. Has anyone seen this before?

2. Chances  I sand it out?

3. Chances they will take it back?

Any help would be much appreciated.

Jeff