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I've had buckled rims on mtbs, from failed jumping onto pavement for instance, and the rim hitting the curb. It's not ideal but I've managed to bent it back and it didn't fail. Only rim failures I've experienced was from over worn braking surface. Depends on the extent of the damage of course. If you don't feel it you're probably right.
Also, I don't mean to ruin your new rim day excitement!
Just hammer it back in place, with brute force.