The NCAA had questions about both Maggette and Kanter before either of them ever were enrolled in school. UK was informed that there were questions about Kanter's eligibility because he was suspected of receiving money before enrolling in school and allowing him to play would jeopardize any games in which he competed. Maggettte and 3 of his AAU teammates were also questioned by the NCAA about receiving money before enrolling in school. Kansas, UCLA and Oklahoma State, like UK, were notified there were eligibility questions involving Maggette's teammates and those players weren't allowed to compete until their eligibility questions were resolved. The NCAA somehow didn't find a problem with Maggette and Duke was never notified there were any questions about his eligibility and Maggette was allowed to play without any penalty. After they learned he had lied and Maggette had taken money and admitted he should have been ineligible the NCAA decided neither he nor Duke would be punished because Duke didn't know had taken money and Maggette didn't know it was against the rules.
You ask if there are any players who accepted money in high school, the NCAA found out later on, and then forced the team to vacate games played. Has the NCAA ever, excluding this case, found out that a team had used a player who should have been ineligible and not punished the player and the school?
This is not true, according to the Wetzel article. Here, I'll just post his time-line, feel free to disagree:
April 1997 to August 1997: Kansas City summer basketball coach Myron Piggie makes cash payments to high school player Corey Maggette totaling $2,000. The money comes from a revenue pool that includes donations to Piggie from professional sports agents Kevin Poston and Jerome Stanley.
Nov. 12, 1997: Maggette signs a national letter of intent with Duke.
October 1998 to March 1999: Maggette averages 10.6 points per game to help Duke (37-2) reach the national championship game, which Duke loses to Connecticut.
June 30, 1999: Maggette is selected 13th in the NBA draft.
April 13, 2000: A federal grand jury in Missouri hands down an 11-count indictment of Piggie, which details the payments to Maggette (along with players at three other schools). By NCAA statutes the payments compromise Maggette's amateur status. Maggette initially denies receiving any money.
April 18, 2000: The NCAA's Jane Jankowski says: "We will have to determine if Duke, in fact, had an ineligible player in the NCAA tournament. And, if so, what monies would have to be returned for use of an ineligible player."
May 23, 2000: Piggie works a plea bargain and admits making the payments.
July 12, 2000: Maggette comes clean and admits he received the cash from Piggie.
Spring 2001: Duke hands over all its information to the NCAA, according to John Burness, Duke's senior vice president for public affairs.
May 30, 2001: Piggie is sentenced to 37 months in federal prison for fraud.
January 2003: Piggie is paroled from federal prison in Arkansas.