edit: why is this in the recipe section anyways?
I'm going to side with pldoolittle on this one, its not the vendors fault that the package went missing and if the signature was mandatory you'd either have to get it shipping to work (solves the problem of it going missing) or wait home all day.
This happened to me once before with a shipment from northern brewer, said it was delivered but it was nowhere to be found, so called them, they called UPS and started a trace on the package. 7 days later it was nowhere to be found so they shipped out a replacement. Yeah it sucks you dont get your stuff on time but things happen. 1 1/2 months later the original shipment appears at my door, still taped up and everything... I'm thinking the driver or the warehouse lost the package sometime en-route and just said it was "delivered"
However if the company jerks you around and never sends a replacement in a sensible amount of time then its probably reasonable to reverse the charges on the card, but most places are reasonable and they do want to have your business.