I'm curious about R524190, as well. I have been using this code for a decade now, and have never been asked for ID. However, my latest rental confirmation e-mail for an upcoming trip had that "This reservation was made using a corporate BCD" verbiage at the top, which had never been included before (I checked all of my previous confirmations). My rental is at a FastBreak location (OGG).

Edit: I should not that it's not the rental confirmation that includes the verbiage, but the rental reminder (trip is in a few weeks).