I'm going to guess it's from some kind of vanity item in the receiver. You could also look at the chain loops. If the paint's chipped or scratched there, like towing safety chains had been repeatedly attached, that could indicate some towing activity too. But from the looks of the receiver tube, that thing has never seen an actual load.
ETA: Wear on the pin hole might be another indicator. Take all this together and it might paint a picture.
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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