Then go and Personalize it with a Char named Warden.A Warden´s Ward of Warding would be pretty cool.
AFAIK the sparkling chests decide first whether to produce magical, rare, set or unique items. In case of magical items, the number of items is greater and a lot of junk, gold etc. will be added as well, but if it's rare, set or unique stuff, the number of items is lower and no junk is added, typically being one or two items in 1 player games.
However, that's just my own empirical, unfounded experience. More details are found in the single player forum.
http://img.photobucket.com/albums/v331/Annie_Ann/Diablo II Characters/Screenshot025.jpg
I love getting items like that.