I can think of one particularly famous SpaceX 2nd stage in heliocentric orbit that even has its own website: https://www.whereisroadster.com/ and I know one was used to send DSCOVR towards Sun-Earth L1, though I'm not sure how it got there:

But it's the SpaceNews.com article about an upcoming launch NASA awards DART launch contract to SpaceX got me thinking, how many Falcon 9 2nd stages are "out there" beyond Earth orbit?

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    $\begingroup$ IIRC, the second stage from the TESS launch was sent into a heliocentric orbit $\endgroup$ – Jack Apr 21 '19 at 7:10

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