Base on this calculation 100k naira was around 600$ in 2011 (1$=165 naira then) and based on the past bitcoin price I checked, in 2011 bitcoin started the year at a price of 0.3$ and ended it with 3$ to 1btc. So imagine you bought at 3$ you will have 200 btc then. Although I wouldn’t say it was careless but that was till a huge amount spent by you when bitcoin was still in the early days. And for you to turn your eyes off it was just something I can’t believe.
Base on the current price you will have $6million which is big but it is what is now.
Do you think another person have access to it?
That depends on how you created your wallet then, because I am not sure there was something like seed phrase then. The only thing I read was available was paper wallet which comprises private key and address so the best thing is where to find the address. If that your friend has access to it probably you shared the key with him but if not then nobody will have access to it