Support shared this with me the other day. I have been unable to verify yet, but they say there is a way you can tell. See below and the attached image. Yes, once a post has been published, the labels are applied and are moved into the Labels section, where they are identified by a gray tab on the left of the label chip. I have attached the screenshot for your reference where the label "CSV1" is applied via Label Rule and the rest are applied manually.
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