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We don't know exactly when the data was exfiltrated, just that it ended in early 2019. It could have been taken at any point before that time.

Earliest date in one of the columns (last login?) is something around 2019-04-28.

Yeah it could be, will have to wait for more details first.

I would not be surprised if FB kept that phone number with a "deleted" flag to this day though.