A Question to Bankers

it was my believe that Banks keeps paper trail of each thing, that has been my experience with EBL.

But yesterday I went to open a bank account to a very well known bank they did not keep most of the papers and as it seem they are neglecting one simple paper they filled.

Now my questions to any Bankers what is the norm?

NOTE: I don’t trust BDs (public and privatr sec cloud infa resilience , security and integrit, that is why my fear.