Back in the caveman days, meat labels were pretty straightforward and didn’t have anything to do with paper, though sight was an issue. So was smell. If you could see it, you could pretty much tell what it was and, depending on the number of flies and larvae, how long since it died, Smell was also a dead-giveaway (so to speak). Claiming it as food was up to whether you minded a little extra protein in your diet, or you minded holding your nose while you cooked.