If you use EVENT_SINGLE_SLOT_UPDATE and any time there'/s a new item, just check if it's a BG box, and note down the unique ID you can get them.
However, I'd argue that you don't need to. If you open a BG box anything new which enters your inventory came from it with a very high certainty. Only way I can see it not being the case is if some addon is messing with stuff while you have it open.
That said maybe the slotId of an open container is something Chip can give us.
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