The CO gave back my passport. After questioning him as to why he said the DS5535 was to verify some travel history, all of which could be seen on DS260 albeit maybe 1-2 trips. Usually, if they keep your passport you’re more likely to have a faster processing! The consulate was quite strict when I had my interview about who they were letting in. We went back to ask some questions after my interview and the guard did not let us go in and just gave us a small note which had the email address to contact them (same one they send your form from) so I’m not sure they’ll allow you in but since you’re in Montreal it’s worth a shot!