I understand it's a bit of a gamble as to who the coins will find. I'd have been willing to come when I first found one, but circumstances were pressing. I'm not sure my companions would have been so pleased to see me go.
To the exact point, with no memory of Atlantis, however long we've stayed here. I've been and gone and returned once myself. The second coin refreshed my memory, but it was at least as much of a shock as the first.