There's no way to see how many you have but if you have four there will be a mission on earth called the first firewall, there's no quest that comes up you just have to look to see if the quests is on the earth destination :)
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I've seen posts saying the mission will be there even if you haven't found all 4 yet. Cannot confirm at this time.
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Thank u
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If the quest is there it means you collected all four? I need to check then.