829. Impossibility or injustice of specific restitution.

The representee1 may not be granted rescission where specific restitution is impossible, or on the intervention of a third party2. One of the conditions of rescission is actual restoration by the representee to the representor3 of all property, if any, which he acquired under the contract, so far as it is capable of specific reconveyance or retransfer4. If the representor can show that the representee received under the contract anything which, whether a thing in possession or a thing in action, was on its acquisition capable of being specifically retransferred5, and which the representee has either lost or destroyed,