I'd have to highly disagree with OS T. The market he is referring to was 1 1/2 to 2 years ago, and is polar opposite to what is going on right now. The market on a lot of the high end items have drastically declined as of recent and I can use many shields in the past few weeks as reference. The q8t -2ench +30 Crude Shield only sold for 140a, q8s -2stance +45stance Celestial was on the market with 0 bids for a week, q8 Shadow Shield -2e +10 vs sold for 50a, and I myself have found another perfect q8 shield for my collection -2e +10 vs that was also under 50a. There is no denying that is a very desirable shield, and I'm sure you'll have some interest but Max's PC is much more accurate. In my opinion I believe that shield to be between 40-70a, and possibly a bit more if you are fortunate enough to have a solid bid war between buyers. Only posting for sale and entertaining offers will reveal the true value, but expecting 250a+ on this will definitely just lead to disappointment and unrealistic expectations.
Also keep in mind that this is still very much a possible drop to have today, though extremely rare.