Autocheck (what CarMax uses) showed no accidents. However, I did purchase a Carfax after I had purchased it from Carmax (for added peace of mind and knowing they have a 7-day return policy) and it does show front end damage, which the shop confirmed. I was just unsure the extent of it. However, the Carfax did not show any body shop visits or activity, neither did any records I could find, although they probably show in detail on records that insurance companies have access to.
I may have been ok with a touched up bumper, but a replacement/re-paint of the bumper, hood, headlight, fender and other front end parts was a bit more than I was comfortable with. The trouble with the reports is that they don't really go into detail if damage is reported.