Thought I should give an update on this. The seller was great and offered to give me my money back or buy a new riser. I didn't want to exercise that option without being absolutely sure that this riser was ruined. Figuring that if it was cracked, it wouldn't matter and if it wasn't, I'd be so relieved, it still wouldn't matter, I removed the paint in the damaged area and could see that a lot of the mark was just a deep gouge but the part where it ran over the shelf and on to the face of the riser still looked like a crack so out came the emery paper. After a bunch of work I now have some really shiny spots but NO crack. It was simply a really bad gouge. Thanks to everyone who helped out!