They don't use actual customer packages for this stuff, they generate a fake barcode/address and slap it on an empty box.If they were purposely mis-loaded by management why hasn't someone told the customer about it so they can complain. I would raise holy hell if I knew some idiot management person had sent a driver on a wild goose chase with my stuff. I would start with a corporate complaint and get in touch with the local media.
I've never had a problem with them salting the loads, the only drivers who get in trouble are the ones who aren't doing their job. It's funny that op is upset about that message because the center manager is actually doing all the slackers a favor by giving them a heads up, if he was really out to fire people he wouldn't have given a warning he just would have waited til the following morning and fired the drivers who didn't report the salts.