Meteorites that come from Mercury?

There was a movie called "8 degrees below" about some arctic dogs left stranded in Antartica. Two guys went hunting for meteorites that supposedly came from Mercury.
One guy found such a meteorite. In any case, I had never of such a thing. I guess I missed some possible clues from 2002. Read below

Friday, 17 May, 2002, 08:37 GMT 09:37 UK

Mercury meteorite puzzle

By Dr David Whitehouse BBC News Online science editor

http://news.bbc.co.uk/1/hi/sci/tech/1991394.stm

Comets striking each other kicking up dust around star?

Comet clash kicks up dusty haze

Collisions between comets may be kicking up copious amounts of dust observed around a dead star.
http://news.bbc.co.uk/2/hi/science/nature/6357765.stm