How to tell if Shimano Ultegra R8100 is Legit

Hi I recently came across a bike on Facebook market place with shimano ultegra r8100 rim never used and I was wondering how can you spot if it’s legit shimano groupset as I can’t find anything online on how to tell.
(I know about the SHIMANO PRODUCT. AUTHENTICATION app but I can’t download it where I live)

If it’s too good to be true it usually is or it’s stolen…

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