Cooper is adorable! Welcome to the forum!
Cooper is most likely a mix of several breeds. His color is brokenblack. (broken = spotted in rabbit lingo) Is he still pretty small? Idon't see any one breed character that stands out. If he is a petstorebunny he is most likely a mini rex or dwarf mix. But he doesn't havethe mini rex fur or the roundness of the Netherland Dwarf.
Whatever he is is cute!! Some characteristics may become more apparent as he gets older. Try again as he ages!