I'm not sure. The reason I knew the answer is because I sent in an app to Wash. U in St. Louis because of a fee waiver, but after receiving a few acceptances I decided to withdraw my app. I called them and told them to withdraw, but apparently they still requested my report. So because I didn't pay for that report the code R8 appeared.
It seems that if your report has been requested then once you have paid the $12 LSAC should send it out. Don't quote me on this but that seems fair.