Nothing goes unnoticed in this world, except people are pretending not to see what's going on. Your wins and losses, your disappointments and success all gets seen by both your enemies and friends. No man could hide from the universe, there are "Earth-Agents" everywhere serving that purpose.
If you do good and it seems no one notice it, you are been watched, so also is doing evil. That is why there are days of reckoning, the days when karma comes visiting and no one could run when that time comes because everything was seen and recorded.
Therefore, whether people see you or not, make sure you do good and treat people you meet with respect and dignity. Irrespective of their status in life, lowlife, middle or high class, something is watching our every actions which will come back to us alive or dead.