OK, some have reported getting miles mistakenly posted to their account, for example, for flights taken by someone else unknown to you.

How about 12K+ flight miles (that's EQMs, folks!) and 10K+ bonus miles? Now we're starting to get into real numbers, and numbers that materially affect one's status! (Not to mention the earning of 500-milers and CR1s.)

Will an audit by the airline discover the mistake (and possibly kick you back into a lower status)? And just when might such an audit occur?

And if one notifies the airline of the error, are they likely to mess up the account in the process of trying to fix it, e.g., by removing upgrades that they shouldn't, and the like?

Anyone have answers?