I have never heard of this nor would I ever anticipate the US Government would validate (basically swear / attest) that something in fact occurred, without extensive additional documentation behind each entry and each flight, as this is a liability issue.
Imagine ABC Express hires a 2000 hour TT pilot who (pretend the FAA indeed does this) came to the interview with "FAA validated" logbooks. They hire him to fly a Navajo single pilot freight.
Company does minimal background/followup to his TT because, well, "The FAA said it was so"
The pilot then can't fly a visual approach (uh, no, bad example, that would be Asiana 777 accident....) and crashes into a day care and kills 50 kids.
Investigation determines the pilot was a private pilot MEL with 300 hours TT.
Guess who is getting sued (successfully I might add) for zillions of dollars ?