Quite possible but the detent is about the same as I found on my 308, which was definitely factory. Also, there is no paint mark on the nut. What I think you are seeing is just reflection/discoloration. I'll have to take a look at the fronts.
If you are going to tell someone how to remove a bolt you should at least know which way to turn the wrench.
85 308 GTB QV red/tan (original owner)
95 F355 Spider SwatersBlu/tan