My first reaction is the same as Randy's - take it back, just based on principle. It's just how I am, how I was raised to be.
I don't know if it's 400 miles one way or 400 miles round trip for you to return the wood. If 400 miles one way then maybe you can try to get a partial refund after sending pics and talking with the provider. If it were me I'd argue for a discount on the live edge areas.
Most larger lumber providers will NOT tell you the walnut is steamed. Anymore, assume it is until you hear otherwise. I will ask specifically whether walnut is steamed before making a trip to buy and I just won't buy online unless it's from one our own providers here.
The steamed walnut I bought worked out okay after staining/finish. Yours will look much better than it does now after applying a finish coat. Wipe some mineral spirits on a few pieces and see how it looks.
Here's a Before pic of my steamed walnut:
Again, here's the AFTER staining pic of the steamed walnut:
The difference before and after is not just stain. I mixed a Japan colors dry pigment stain of burnt umber and mineral spirits for the table. It was NOT a dark stain. It did even out the color a little and made the stock very usable.
If you don't like stains then dyes or maybe toners could help. :dontknow:
Chuck