I'm certain someone here will know the answer to this

Apart from the Eclogue/Grand Fantasia and Toccata, did GF leave behind any sketches or evidence of intent regarding how he might have completed his Piano Concerto? The (relatively) recent reappearance of the "complete" Violin Concerto gives one hope that a stray page or two might turn up beneath an old hedgerow, somewhere...
A pleasant fantasy, anyway
