What should I do with the box of tea given to me by a company owner, which I am unable to return to him after being advised that it is a bribe?

An employee is not permitted to accept a gift because of his work, due to the prohibition of the Prophet, peace and blessings be upon him, who considered it to be an embezzlement. Whoever accepts such a gift is obliged to return it to its givers or hand it over to the employer for whom it was given, unless the employer grants permission for it.