I have traced every Gox->Dwolla transfer and every Dwolla->my bank transfer. There are zero dollars left over. No duplicate transactions.
They are saying that I setup a single Gox->Dwolla transfer for $1,000. They then say that they accidentally put $1,000 in my dwolla account TWICE.
Had Gox double sent money to my Dwolla account I would have noticed within a day.
To me it seems awfully fishy that they said their fiscal year ends March 31 and now it seems they are stalling.