Blasey Ford passed an FBI polygraph test. The letter she sent to DF was kept confidential at CBF's request and only turned over later on after an outside source reported that DF was withholding a BK related document.
Later on, after the televised hearings, Senator Jeff Flake and the Senate Judiciary Committee requested an investigation. Trump ordered an FBI supplemental background investigation concerning the allegations, but Ford, Kavanaugh, and dozens of other witnesses were not interviewed by the FBI due to restrictions imposed by the White House.
The fact that a few people who she said were at the party either didn't remember or refuted her claims outright, is proof of nothing other than they either don't remember or wouldn't admit they did out of personal loyalty to BK or political bias.
I'm sure for everyone else who attended, it was just another run of the mill party that happened so long ago, it didn't stand out in their minds. Nobody remembers every party they went to a