Was Judas present for the passing of the emblems?
No. There is probably no part of the story that is true. The concept is essentially borrowed from older god-man myths.
Even if some guy named Jesus sat around for a meal with a few mates, they still didn't eat and drink 'emblems'.
Also, out of the four gospel accounts only the book of John mentions Judas leaving during the evening at all.
Despite some efforts by apologists to reconcile the 'gospels', they are a mess. And John is the least consistent of the lot.