That's only possible for EU players using the prepaid 60 days time cards as those are adding the actual subscribtion days to your account upon redeeming them while in NA / US using the prepaid cards you'll recharge your Crysta instead and until your free period (14 / 30 / 60) days will expire it will not "charge" you for the next 30 / 90 / 180 sub hence you'll be unable to obtain the veteran bonus items until then unfortunatelly.