What is the ruling on disposing of trusts left with the questioner, especially after a long period has passed and it is not possible to communicate with their Christian owner, and is it permissible to send them by mail despite the fear of them being received by another person?

Disobedience does not invalidate repentance. Rather, whenever a servant sins, he must repent and seek forgiveness. Repentance for a sin is not nullified by its repetition. Instead, he remains obligated to repent after every sin. He must be sincere in his repentance, regret what he has done, and resolve not to return to it.