The court may revoke said letters of administration at any time, upon satisfactory proof that the supposed decedent is in fact alive. After such revocation all the powers of the administrator shall cease, but all receipts and disbursements of assets, and other acts previously done by him, shall remain as valid as if said letters were unrevoked; and the administrator shall thereupon make a settlement of his administration to the date of revocation, and shall transfer all assets remaining in his hands to said supposed decedent, or to his duly authorized agent or attorney; provided, nothing in sections 473.697 to 473.720 contained shall validate the title of any person to any money or property received as widow, next of kin or heir of such supposed decedent, but the same may be recovered from such parties in all cases in which such recovery could be had if said sections had not been passed.