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by lnanek2 4925 days ago
Boxes, packages, letters etc. can get ripped and shredded by processing machines and conveyor belts and truck doors, etc.. I've gotten remnants of destroyed letters delivered before. Given the huge amount of mail moving through the system, even a small percentage experiencing accidents can amount to a large number of damaged items. The insides of these things don't always stay inside all the way through their trips, basically.