I don't have to prove anything regarding my collection. All I have to do is satisfy myself and other collectors whose opinions I respect that my items are legit.
That's the best anyone in this hobby can hope for at this time. Furthermore it's really impossible to compare a $500 common Army dagger to a perhaps $50,000 Honor dagger. The incentive for fakery just isn't there with common items.
I fully expect that the daggers that Atwood and others, which they primarily assembled from period parts, are essentially undetectible today from pre 1945 examples.
Furthermore some of the biggest names in this hobby,both dealer and collector, are known to have ruthlessly switched dagger parts around over the years so it's quite possible that many of us have examples in this category.
I have tried to minimize the risk of obtaining daggers in this category by being very selective about where and from whom I've made my acquisitions.
Jim