Eduard Franck Piano Concertos 1 & 2

[Gareth Vaughan]

I think that if it is not listed as extant by Dr Feuchte, it is currently lost. This does not nean, of course, that it may not turn up somewhere in the future. But that is mere speculation.
Incidentally, both the Thieriot concertos mentioned by Eric are not re-orchestrations. They are modern editions prepared from the ms full scores in the Thieriot nachlass in Hamburg. Walter Zielke, an expert on Thieriot, told me that he knows the whereabouts of the ms full score of the two-piano concerto but he was coy about revealing it - which suggests to me that it may be in his own collection, and that he may produce an edition when it suits him (i.e. if someone wants to perform/record it and will pay him to do so for them).