What items? To a point. We might know what items but sometimes not what quantity were used.
It's not possible to know the exact usage quantities, but at least we can know what was used. For quantities, we can get the maximum amount, because after the actual HP is depleted, the replay generates new full-health troops, causing quantity errors. But have you considered... that some people really do bring 5 flags... This is another secret that can't be discussed, because in reality, even the number of flags can exceed limits in this game... This is also something I've witnessed firsthand, but I know you don't believe it.
I just want to tell you that for some concepts, you need to think beyond the game's framework. Don't let the "inaccuracies" you know about affect possible perspectives.