Scroll of strong unlock

I’ve having a problem with accessing the thieves guild storage last the like trap, I don’t need to have a strong unlock scroll (maybe used it by mistake) and cannot find a new one, I’ve visited every shop, is there a way round this or somewhere I can get one I haven’t looked yet

Shop inventory is randomly generated so you could just go around and hope to find one.

However it's not really necessary to get into that storage so you could just leave it. (It's really meant for "real" thief characters with a high level of Lockpick skill.)