Well I haven't gotten into knife trading just yet but I do buy/sell a lot of computer gear and personally, whenever I sell something, I always post it as the price I want for the item + shipping. The buyer pays shipping so he can have it shipped wherever he wants, through whatever company he wants and with whatever extra services he wants... If the buyer chooses a cheap, non-trackable method, I always retain the receipts as proof of shipment just in case of a dispute.
As a buyer, I personally make a point to ask the shipping method that will be used for items listed with a flat (shipping included) price. If it doesn't suit me, I try to negotiate for a method to my liking... However, I live in a neighborhood with a lot of paranoid, elderly people so the chances of anything getting lifted off my porch is very unlikely.
Assessing your situation from an objective and legally-minded stance: Between yourself and the other party, you are the only one who knows your neighborhood and the only one who can assess whether or not your situation merits extra services such as delivery confirmation, insurance or a required signature. If you didn't communicate these needs or inquire about the shipping method, the other party has no obligations to do anything past send the item to you. The only way he would be at fault is if he has no proof of shipment (i.e a confirmation number or receipt).
Just because you made a point to add extra services, it does not mean he was obligated to do so as well unless that was communicated and agreed upon.