For customised devices, i.e. components that a specific customer only has manufactured for him, a data sheet is also only available for this customer. Logically, it is not available for other customers; after discontinuation, all documents were destroyed anyway.
Now one could speculate where the Asian seller probably got these devices, but that doesn't help anyone. In any case, it is a bad idea to buy components of which you do not have the documentation beforehand.
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Regards
/Peter
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