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I had a look and enlarged the image. It shows at least two rather substantial nicks in the outer flange of the head that indicate that they have been pretty well knocked around during their lifetime. If he did take them off an original car, then they have either been on and off several times before he got to it or they have been lying around in the bottom of a tool box or similar for many years since.
They have not been well looked after and I'm sure that there are ones out there in better condition.
Those bolts are correct for 67s. I believe the 68s had an A headmark and the 69s had an LF headmark. I have seen real FP bolts go for 750 so this is nothing new. Real ones are tough to find and some have tried to reproduce them recently. The ones on Ebay appear to be real.