The Stat bonuses are the "bless" charges. When equipped the charges are automatically used as they wear off. Quite a few bless items are still around, but most players don't use them because the charges wear out too quickly to make it viable.
It was very creative to imbue it and you might find someone interested in purchasing it, just don't expect it to a windfall because after the charges wear off, all they have is a SC 15% DCI shield. I hope you find a buyer, but make sure you don't seem as if you are trying to deceive the buyer as the stat boost it gives is only temporary until the charges wear out.
Best of luck with your shield, sir!