You have no clue what the FBI or the Met Police have found regarding Andrew. and neither do it, but the FBI want to question him so they have something to ask him. They aren't going to just listen to him talk. Also, most people who saw Andrew's interview and heard the lies he told know he is as guilty as sin to say nothing of being a laughingstock, apparently to everyone but you.
According to an article published in yesterday's Sunday Times, the FBI is interested in interviewing Andrew about his friendship with Epstein. The article quotes a U.S. Dept. of Justice source: "If he agrees to an interview, he could potentially provide some very unique and helpful insights and make a considerable difference to the investigation.”
In other words, the FBI isn't interested in questioning Andrew as a suspect, at least now. They want to see if he has information that will help them with their investigation.
In addition to Andrew, Virginia Giuffre has stated she was forced into sex with several other prominent men, all of whom have vehemently denied her claims. Some have also stated they've never even met her. So unfortunately we're left with she said/he said.
Of course this may change if new evidence is uncovered during the Epstein investigation.