(c) He is not obliged to restore the fruits of his own labor or industrial fruits (e.g., the extraordinary interest derived from the owner’s money through the good judgment and energy of the possessor), nor the fruits that he consumed without enrichment (e.g., the vegetables he gave away or wasted).
1773. Rights of the Possessor in Good Faith in Deducting Expenses.—(a) He may deduct for all expenses that have benefited the owner, that is, for all the money he spent in necessary or useful ways in preserving or caring for the property. (b) He may not deduct for expenses that have not benefited the owner, or which the owner would not have reasonably authorized, such as special beautification of the property. But he may take away such adornments added by him as can be removed without injury to the property.
1774. Obligations of the Possessor in Bad Faith in Reference to the Property Itself.—(a) If the property is still in his keeping, he must return it to the owner, for a thing calls for its owner. But if the actual possessor had the property from the thief and could not restore it to the owner without serious loss to himself, it is held by some that he could return it to the thief in order to recover his money.
(b) If the property has perished or restitution of it has become impossible, he must compensate the owner, even though he has not been enriched, unless the goods would have perished equally with the owner; for he is then the efficacious cause of the loss. The same principle may be applied to damages through deterioration. The civil law often holds the thief responsible, no matter how the goods perished in his hands.
(c) If the property is in possession of a third party who bought it in bad faith from the possessor in bad faith, the seller is not bound to restitution to his purchaser on the purchaser’s eviction, unless there was agreement to that effect; for he who buys, knowing that there is no good title, buys at his own risk.
1775. Obligation of the Possessor in Bad Faith in Reference to the Fruits of the Property.—(a) He must restore the natural and civil fruits, even though the owner would not have obtained them from the thing, but he may keep the industrial fruits.
(b) He must make restitution for the profits lost and the losses suffered by the owner through the unjust deprivation of his property, for these are damages of which the possessor was the unjust and efficacious cause.
1776. Obligations of the Possessor in Doubtful Faith Who Began Possession in Good Faith (Supervening Doubt).—(a) If he does not culpably neglect attempts to settle his doubt, he becomes a possessor in good faith. If the doubt is settled against him, he must restore (1771); if the doubt continues, he may retain possession and prescribe (i.e., acquire ownership through long exercise of ownership rights), for presumption favors the possessor, but he must he willing to restore, should another appear as the rightful owner.
(b) If he culpably neglects attempts to settle the doubt, he becomes a possessor in bad faith. If the doubt is settled against him, he must restore (1800), at least for the time during which his culpability was grave; if the doubt continues and its settlement is impossible through his fault, it seems that he should share ratably with another claimant according to the strength of the respective claims; if the doubt continues and there is no other claimant, it seems that he may act on the principle that presumption favors the possessor.
1777. Obligations of the Possessor in Doubtful Faith Who Began in Bad Faith (Antecedent Doubt).—(a) If the property came to the possessor in doubtful faith without legal title (e.g., by violence), he has the obligations of one in bad faith, for presumption favors the former possessor.