When finding and taming a 2 star boar near a Boar Rune, the best strategy is to breed it right there, then move the offspring. A 2 star will always produce a 2 star in my experience. A 2 star tamed near a Boar Rune will always remain near the rune, it's a pain in the derriere. I've never successfully relocated one, but their offspring will relocate fairly easily ...

The other option is to build a boar pen around the Rune, like I did.