Discussing problems with shipping companies, @internetrules said in another thread:
One thing you could do is never rely on shipping companies to either pack things or even to correctly put labels on them.
When I ship stuff, I print out the label myself (on the carrier website, at a third party site like https://www.pirateship.com/, or from the store website if it’s a return), affix it to the box or envelope myself, and just hand the carrier the finished, sealed/taped, labeled shipment. You can do this even for stuff like next day service (though for certain services you may need to use a special envelope or box). Yes, they could still smash it or misdeliver it, but I’ve at least eliminated one potential set of things that could go wrong. It’s very sad that you can’t reliably outsource putting stuff in a box or envelope and putting a label on it.