Listed as "No. 2" in Appendix X.1 of Grove's "Haydn, Joseph" article. Grove says "extant as III of appx W.1, 13b; trio doubtful; cf Q 26"
Yale metadata suggests this is part of Hob.VIIb:3, which Grove lists as "lost or = no. 5" where "no. 5" means <a href="http://elvis.music.mcgill.ca/node/1582">Hob.VIIb:1</a>, the cello concerto.
In short, I don't know if the Hoboken number is correct.