I doubt it's really intentional that openable containers in your inventory pass a value where a GUID should be, especially if the behavior is not consistent.
Originally Posted by Simca
Creating a workaround to catch players opening the same box many times in many different situations would be challenging.
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Why exactly do you need to keep track of this? You didn't say what your addon does, and neither of the addons you are listed as an author for appear to be related to looting, but I can't imagine it's a common scenario for users to open the same box over and over again without looting its contents.