I did this, just say you sold the old 3ds and bought a new 3ds and like to use you old nnid.
I wrote one mail, with the info;
Nnid, username, email and birthdate. The next day, i could sign in to my old nnid on my n3ds 9.5 emunand spoofed with FMP
just to find out ironfall was just removed from eshop,
But i wonder about one thing.
I downloaded ironfall on my old 3ds, with the same nnid i use on n3ds, can i take the ironfall folder on sd to my n3ds sd, i have installed ironfall cia on my n3ds. Replace my ticket?