Heres to another Satoshi Question

So far I sort of grasp the history of who Satoshi was and whatnot, but when it comes to the bitcoin he/she/they held, how do we know for certain that the alleged 1 million bitcoin have not been slowly sold off over the years. Is it possible to gift someone bitcoin? Would this not be an option for Satoshi. Moreover, how is that alleged 1 million BTC being stored and where, (exchange, service such as coin base if transferred?)

I should also note that my understanding of Satoshis application of blockchain technology is not the best even after writing a paper over it. Mainly because I'm not a computer nerd. Satoshis paper did help but only to confuse me more when it came to nodes, hash functions, and the whole ordeal that kept BTC from double-spending.

Edit: currently watching https://www.youtube.com/watch?v=_Kav2K1DVWo

among... https://www.youtube.com/watch?v=fMWnaR5uJxQ

and https://www.youtube.com/watch?v=NMDZcbkgpJA&t=117s to understand how brokers work with crypto for pyramid schemes