Under the banner of 'Murphy's Law' , I think I will vote on the side of caution.  I have a box with a lid marked, 8-30 as well, but only 'smokeless' rather than 'Staynless' and there is no 'Staynless' or lot number on the box itself.  The ammo is marked '30 Army' which is different.  So, we have two lids marked differently and two boxes with cartridges that are different.  Which do you think is correct - if either.  Knowing my success rate in situations like this, I will assume I have a replaced lid and corrosive ammo.