LittleToe....In answer to your question, I was just looking at Russell-era stuff and it looks like the view in those old texts was consistent with the later claim by the Society. Although they don't explicitly say that Judas wasn't at the Eucharist, they harmonize the synoptic account with John in the same way that suggests that Judas left before the institution of the bread and wine:
***ZWT, March 1891, p. 33 The Coming Anniversary Supper***
And though a Judas was present, he was given a sop and went out from the others before the supper was ended; thus no doubt representing that in the close of this age, before the little flock will have finished their part of having fellowship with their Lord in his suffering, the sup of truth will have become so strong as to drive forth from the company and communion of the faithful all who do not rightly appreciate and value the ransom accomplished by the Lamb of God for the taking away of the sins of the world.--1 John 2:19.
***ZWT, October 15, 1906, p. 333 This Do in Remembrance of Me***
Respecting this supper our Lord himself said, "With desire have I desired to eat this Passover with you before I suffer." He did not refer to the principal feast, which lasted a week from the 15th day of Nisan. He was referring to the roast-lamb supper, eaten with bitter herbs, which preceded the general feast, and which reminded them of their deliverance from Egypt, and became the basis of their subsequent rejoicing as a liberated people. The upper room was provided for this supper. Things were made ready, and at even, at sundown, after six o'clock, our Lord and the twelve assembled....Jesus [said] that the one for whom he would dip a sup would be the betrayer, and having dipped the sup--a piece of the lamb and a piece of the unleavened bread they were eating--Jesus gave it to Judas, thus indicating him without directly naming him....[According to John, it was then that Judas left.] It was after the Passover Supper, after the eating of the lamb with the herbs and unleavened bread, etc., that Jesus instituted the Memorial Supper which, with all of his followers, by his direction takes the place of the Passover Supper of the Jews. This was a new matter, and the apostles listened with interest to his words as he blessed some of the thin cakes of unleavened bread and then brake them and handed portions to each of his disciples, saying, "Take, eat; this is my body."