Is one absolved of responsibility after returning stolen goods and donating their value on behalf of their owners, while concealing one's identity out of shame?

You have done well in seeking absolution from those whose rights you violated. Forgiveness is sufficient to absolve you of their right. There is no harm in concealing yourself, as the Prophet, peace and blessings be upon him, said: "Avoid these abominations that Allah has forbidden. Whoever commits any of them should conceal himself with Allah's concealment and repent to Allah the Almighty." What a child does before puberty is not sinful, for the Prophet, peace and blessings be upon him, said: "The pen is lifted from three: from the sleeper until he awakens, from the child until he reaches puberty, and from the insane person until he regains his sanity." However, he must guarantee what he stole, because lack of legal responsibility removes sin but does not remove the obligation of restitution. For repentance from injustices against people, it is necessary to return the right to its owner and seek absolution from him.