Doesn't look like an actual plate to me... Some states (or all) don't require to have a plate at the front, so if that's the case, I don't think there's anything wrong with putting that there. If it's not an actual license plate that is.
I put some of my old European plates on the front of my German sports cars here in GA. We are only required to have rear plates.
They were taken at different times & just didn't sensor them. You thought right about the plates, then again neither is doing 31 in a 30, ever done that? Probably not
I'm a safe driver who sticks to the speed limits I don't want to be caught out by no God damn speed cameras.