You should provide raw data to boxplot(), not summary stats.
If you want to input summary stats, there was a post some time ago on that:
http://finzi.psych.upenn.edu/Rhelp10/2010-September/251674.html
<\quoate>

Overwriting $stats did the job for me. I wanted to show the effect of using
different quantile computation methods. 

Thanks a lot to everybody for the quick answers!

Tom

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