The worst one for me was with DHL. $20k of diagnostic electronics left at the door, when package was supposed to be held for two days due to an emergency trip. Signature for customs broker and shipper were both required, and the delivery person left it outside anyway - on a package that shouldn't have been on the truck in the first place.
I came back to torrential rain and no equipment. Package gone. DHL swore that they had retrieved it, as requested, but couldn't find it in their system.
At the end of a full day of carving out new orifices (orifii?) over the phone, a cute new Mommy from two town homes over came by with my package. She had seen it getting soaked, and had taken it in to be neighborly.
Not to be contrary, but you did have a cute Mommy (literally) deliver the goods. That's better than most deliveries at my door. Just sayin'
