Side edges too?
No offense, all I got from your question is that you couldn't tell if the edges had been sharpened except for the fact that they no longer had rust. And then you seemed to be seriously considering detuning them with a rock.
I can see grinding the base and taking the rust of the base side of the edges. If the side edges are now shiny too, then it has very probably been sharpened. If you run your finger down it and it feels sharp and smooth, then ...well... it is.
No one sharpens the tip and tail...why would you?