Is a woman who returns a garment sinful for not informing the seller about a small pinprick mark on it, even though she knows the mark does not detract from its appearance?

If the defect in the "konela" (a type of fabric) is minor and does not reduce its price, then there is no harm in not informing the shop owner about it. However, if the defect is significant and reduces its price, then it is obligatory to inform him. If it was sold with the defect deliberately concealed, then repentance is obligatory. If it was due to forgetfulness, there is no blame. In this case, it is obligatory to inform the shop owner and compensate him for the reduction in value, or return the konela if he does not accept the compensation. If he cannot be reached, then the value of the reduction must be given in charity on his behalf.