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An oil analysis (Blackstone Labs) could definitively determine metal content at any number of miles.
Presumably, if you were only going to do a single "break in" oil change, it'd be done after particle contribution rate had "significantly" diminished - perhaps to no more than 5-10%. Otherwise, the process could continue at a significant rate after the premature service - and you'd be driving with grindy bits flowing through your engine for 10-12K miles longer than necessary.
Even if the car was drivin very hard from the start (against advice of BMW), it's not clear that the oil at the first 100mi would even contain most of the potential break-in particles.
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