While that is a great looking guitar... And I doubt that it is a fake... I think it would be darned near impossible to prove weather or not those F-Holes were factory cut. They do seem to have a fairly odd looking shape to them but that means nothing.
I wouldn't imagine that there would be any doccumentation in any data base depicting the job, and without that, many people are never going to believe the story.
Don't forget, "vintage value" needs to be proveable. That is what makes it saught after and rare from a financial POV. As a guitar, it is what it is. A collector will see more value in the doccumentation than in the guitar itself so the point is pretty mute unless it is for sale and the rule still applies...
No proof and people must assume it is an aftermarket modification, regardless of what they personally believe.
On the other hand, a player is just going to buy it based on how it sounds and feels. So even if you did have a purchase order that showed the custom work on it, that buyer is merely going to say - "Well that is good" and then put the bill in the case and play his guitar.
I would hope that you didn't pay extra money for the guitar when you bought it based on hear-say evidence as that would be a bit tragic, because, just as it is in a court of law, It only matters what you can prove!