I think I also heard of guys opening the bags, slightly breaking up the pellets a bit, and letting them “air out” a bit until they lost most of that character. Then they used it on the hotside
IVe had success this way. I had a bad bag of Columbus that I needed for a 60 min addition. I went ahead and used it. I sealed it up in the Mylar and vac sealed that in a normal seal bag. I opened it up a few months later and it smelled wonderful.
I don’t think it takes alot of O2 but time probably helps