I'm not with the postal service but I do not believe they can help you with that? I suggest a home cabinet(Target, Walmart, Amazon, and the like) large capacity, possibly a safe if they are very valuable. Or if you have extremely large amounts of items to save, try a public storage facility. They are easy to obtain and offer lock and key protection. If it were me, I would just buy a large, airtight, weatherproof cabinet or even a plastic container(very cheap). I hope this helps you out? Good luck! :)
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