For what it's worth, I've worked as a vet tech in exotics practices, done rescue work, and unfortunately also have experience with broken ribs in one of my snakes. One of my little Children's pythons suffered several broken ribs after an accident subsequent to an escape (I posted about it at the time so won't repeat the story here).
There's honestly nothing to be done about broken ribs other than providing pain medications (my girl got injections every other day for two weeks).
The fact that your snake has been eating would lead me to at least suspect that there were no broken ribs - these are quite painful and snakes typically stay in their hides and won't eat until they've started to heal. I don't think the dimpled areas you have noticed are cause for concern - in my own snake, and in others I've seen with broken ribs, there is often no external visible sign; the broken ribs are seen only in X-rays.
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