Yeah, bought from Mouser so they are probably not counterfeit.
...so if they are counterfeit or wrong parts, I probably get my money back. <= corrected
I've received parts with wrong markings directly from manufacturer; i.e. I ordered part x and received parts that were marked as x, but were something else; a genuine error from their part. Well, those boards were easily sold:-). My company has also received counterfeit op-amps from manufacturer's distributor. That one was never fully find out; a warehouse worker side business remained the most likely explanation.
Nowadays I would suspect, in order:
1: Myself or my interpretation of the datasheet.
2-7: Ditto.
8: Wrong part, especially on components that don't come in full reels.
9: Counterfeit part, if they came from anywhere else but factory rep. As noted, distributors can be tricked, factory rep maybe not so easily.
10: Datasheet error. Not in pinout, though. But the more complex the part is and less used, the more likely you hit on something that no one else has so far. I can tell 5 or 7 issues on the DSP I'm currently working with where it does not behave like the datasheet says. (Most of the nature of: datasheet says A. Normally so, but if condition B or you manage to do X in certain timeframe, then A becomes something else.)
11: With programmable parts, after making sure my code is correct (and re-checking one to ten thousand times or thereabouts): The compiler. I once spent a month first finding out and then proving, that the compiler produced working code but with different logic than the source.
12: Error in marking of the part. Usually the factory knows what they are making at a given moment, but not always, see above. Humans run the factories, too.
13. Something I've not seen before. And as you can see from the list, I've seen a lot.
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