Iowa Code § 556F.17: Penalty for selling.

If any person shall trade, sell, loan, or take out of the limits of this state any such property taken up or found as provided in this chapter, before the person shall be vested with the right to the property, the person shall forfeit and pay double the value thereof, to be recovered by any person in an action, one half of which shall go to the plaintiff and the other half to the county.