Zvika – if a product was originally Otzar Beis Din, and then someone took it and sold it shelo k’din, that does not change its status at the time that it was Otzar Beis Din. As such, if you consider the hechsher that stated that it was Otzar Beis Din reliable, and the wine was still in production at the zman bi’ur, it should still be fine, even if someone else sold it afterwards.
Re: destroying unspoiled Kedushas Shvi’is products – I find the psak you quote from Rav Elyashiv ZT”L very strange, as it contradicts what I’ve heard from all of my Rabe’im and Poskim over the years. Are you absolutely sure he said that?
an Israeli Yid