There have been suspicions that it came from Texas, not proof, this trail could lead to proof.
And once you have the source, then you can ask questions of this source "how did you get this", where did it come from. If the documents are real then you can trace it back to Gillian's file, if it's forged, then the source will not be able to form this trail, thus proving that it was manufactured.
In the Gore War the DNC used a Texas telemarketing company to make their calls on election day advising people they might have voted for the wrong person - and telling them they should go protest to the county officials.