Hey Tony and everyone!
I had found either a forum post, or in the documentation, a setting that you could enable that would automatically create a variable for you that you could reference to check whether or not the current Conversation has already been 'seen'.
I remember in the post/documentation it said something like "only enable this if you don't have super crazy big conversations" or something like that haha. I've been looking for that setting for like 2 hours but I can't find the forum post / part of the documentation that mentions it!
Thanks for the help!