All my 50 cal cans are over 25 years old so I am not worried. Interesting about China making the new ones, I will have to check next time I see them. One thing people can check for all types of military cans are the local scrap and salvage places. We have one in our area which sells various types of cans at more reasonable prices. Thanks for the tip on the silicone for the seals, I’ll have to check mine. Another good box are the aluminum ones only if they have a seal. Most of these were used for medical use and by being aluminum won’t rust.