From WRAL article:
Among other testimony from Dismukes:
Dismukes saw a purse in the floorboard of Nancy Cooper's BMW SUV with cash and a pair of children's jeans on the car seat. Outside, he observed a floor mat on the ground between her SUV and Brad Cooper's BMW that appeared to belong to the car.
Brad Cooper told investigators that, although he did not see his wife leave, he thought his wife usually wore a black and red sports bra when she ran. Nancy Coopers body was found with a similarly colored sports bra, the only piece of clothing on her.
** note: the article doesn't say WHICH car that floor mat belongs to, but I'm thinking it was BC's.