r’ Israel yid I happen to be quite familiar with hilchos shviis. if the wine was in the hands of otzar beis din it is indeed not chayev in biur. the issue here is 1. if it was in the stores then it was chayev in biur. 2. most important if this wine is being sold regularly in the store the otza beis din Is a joke and has no halachic value; if I or you are going to put a stamp on the bottle stating it is otzar beis din it means nothing; an otzar beis din is only a beis din to distribute peiros shviis for the benefit of the tzibur. therefore any wines being sold in stores by companies that are selling the wine as usual have no otzar beis din no matter what it says on label and are asur since it is past zman biur and was not in hands of REAL OTZAR BEIS DIN.
even though it has kdushas shviis it COULD be destroyed even if it is edible; since the mitzvah is to be MVAAR peiros shviis; at the time of biur or after that if it was not done at the time it has to be destroyed and does not have to be spoiled. [I personally got a psak from rav elyashiv when I had a case of wine and was safek if biur was done properly; and he told me to just spill out the wine]