Guys, these are silicon wafers not bars of steel. You can't just stockpile 40% of annual capacity in a warehouse long-term. I would be incredibly surprised to find that any such large scale storage facility exists. Any storage of undiced wafers is temporary while the manufacturing pipeline proceeds. You've seen the pictures of clean rooms and stuff. There's no way you spend all that effort to make the wafer and then just stick it in a warehouse. Who even is going to make such a large cleanroom facility? And for what exactly? It doesn't even pass the basic sniff test.

Much more likely this is just a detail of the contract so that OpenAI can guarantee allocation. I would be surprised if the actual wafers entered OpenAI hands before being fully packaged.