The Spurs has to be the most notorious example of tanking to get Tim Duncan. All indications were that David Robinson was perfectly capable of playing and they kept him out. Same goes with Sean Elliot who somehow had tendinitis for almost the entire season and Chuck Person who suffered from season long back spasms.
To me it's the most notorious example of Boston fans led by Bill Simmons shaping public opinion. They did not tank. No one but a fool would have played Robinson once the season was functionally over especially given his injuries. He missed the start of the season because of a back injury and then when he returned he broke his foot and wasn't cleared to play again until late in the season.
They were leading for the best chance at Duncan when they fired Bob Hill and won at a higher rate once Pop took over. If they tanked, they sucked at it as they raised their winning percentage over the final 25 games of the season.
Boston flat out, unquestionably tanked that season and they were bitter over the fact that they had a much worse record than the Spurs but got beat out in the lottery.
The Spurs on the other hand lost 4 of their 6 best players to legitimate injuries and two of their veterans (Avery Johnson, Vinnie Del Negro) simply went into age-related decline and were never the same again. Boston just benched their guys or pulled them in key moments.
Yet, the legend continues. More often than not you'll see the Spurs listed as the most successful tank of all time. And the facts say it's just wrong. Keep in mind they looked like a lock for the worst drafting record (the expansion Vancouver team wasn't eligible) and still brought Robinson back for 6 games until he broke his foot.
As for Sean and Person, Elliot battled tendonitis much of his career, Person had chronic arthritis and was never the same again. Sean probably could have played the final 10 games or so but even if there was no draft it wouldn't have made sense to bring him out that late in a season that was long over for them.