Is it obligatory to return a trust that has deteriorated over time in its current condition, or to compensate for it, especially since its owner is missing and his family is claiming it?

The trustee is obligated to preserve what has been entrusted to him by customary means. He is not liable for its destruction or damage unless it resulted from his transgression or negligence, because his hand is one of trust. Its preservation is obligatory, and the trustee is only liable for transgression, negligence, or betrayal. The wood must be returned to the heirs of its missing owner, and its deterioration does not entail any liability.