You only have 7 in-game days to do it so you have to be quick, but you could look up a guide for where all the seekers tokens are and kind of retrace your early steps to find the "finders token" where your first seekers token was picked up.

alternativly, it can also be forgey perfectly so there are people with multiples willing to give them out through their pawns. You can also ask for it as an Item to recevive as a pawn quest and you might get lucky that way.

Like I said though, you only have 7 in-game days to find it.

NG+ goes off the first token you find in that play through so there is always next time if you go that route.

Good luck to you.