I hate dull pins with a passion. They offend me. I don't even TRY to salvage them, I immediately put them in my "sharps" tub and they get recycled along with all my dull and broken machine needles and dull rotary blades. Same with pins that have burs. Although if I had a whole box that was bad I'd bother to return them. (assuming they were a recent buy..bummer for you, AngeliaMaria!)
Life is too short to waste on dull pins.