I would worry much more about which seedbank(s) actually fulfill orders and don't rip you off, as opposed to which one is 'stealthiest'. They're all gong to ship out in pretty much the same fashion, that is IF they ship them out to you once they've taken your money. Almost all of them have a 'steath' shipping option also.
People seem to be getting good results with the Attitude seed_bank here lately....