The thing from the Bayou wrote:

^No. Seven knows because she was still in the collective when First Contact happened...
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Yet the Borg in 2063 were out of contact with the collective, hence them trying (and failing) to convert the Enterprise's deflector into a transmitter. So there's no way Seven or the other Borg of the 24th century would know how First Contact played out. But they did - because the FC survoivors sent their dignal in "Regeneration"