Is the amount of 50 riyals that I obtained from a discount, and the amount of 10 riyals that I obtained from bank points, considered unlawful (haram)? And what should I do with them if they are, especially since their owners are unaware of this?

It is not permissible to take a commission unless your colleagues are aware of it because you are their agent, and an agent is obliged to do what is best for their principal. Therefore, you must seek your colleagues' absolution or return the money to them by any possible means, and they are not required to know the details. Donating the money without their knowledge is not sufficient as long as you know who they are.

As for benefiting from bank points, there is no harm in it because it is a reward for using the credit card.