ok, i did some research on this:
apparently neil owns a duojet and a firebird.
the DUOJET was given to neil by a guitar store owner in Austin:
from an interview in 1998 with neil, where he was asked "what's your most treasured possession?"
"It used to be my Gretsch Duojet guitar. I was in Austin, Texas, feeling miserable because I had the flu, and this guy who owned a vintage guitar store showed me this guitar and turned up at the show that night to give it to me."
it was also the DUOJET neil lost:
"Unfortunately the airline lost it on the way from Melbourne a couple of years ago, so that was my most treasured."
ok...so we know neil has the firebird, because he plays it now. but did he ever recover the duojet? i seem to recall him having a duojet. didn't he play one on suffer never on the seven worlds collide dvd? it's a blueish color with silver trim...