IMSLP now has a piano duet score of Napravnik's 3rd, (http://imslp.org/wiki/Symphony_No.3,_Op.18_(N%C3%A1pravn%C3%ADk,_Eduard)) "Demon", symphony in E minor (1874), for such as have been interested in having a look (I still know of no broadcast or other performances, but at least one now can have a look more readily.)
I'd love to have a go at one of the symphonies! I've downloaded the Fandango for orchestra and I already have the Concerto Symphonique. If I could have a symphony I could burn a full CD for my conductor contact!
Czech Radio Archivy (http://www2.rozhlas.cz/archivy/) lists 25 recordings of various works and selections by him but not from his symphonies. Maybe somewhere.
(A partial manuscript, violin 1 part only and only a few pages, is in the Henry Gilbert collection of Yale University, btw...)
I thought you might be intrigued to read that last year I published a little salon piece by Napravnik. Scherzo Espagnol was originally written for violin and piano but it works excellently for piccolo and piano: hear it on soundcloud at http://soundcloud.com/rosflute/napravnik-arr-tr-bger-scherzo (http://soundcloud.com/rosflute/napravnik-arr-tr-bger-scherzo)