South Dakota Codified Laws
Chapter 41 - Lost And Found Property
Section 43-41-3 - Finder to notify owner.

43-41-3. Finder to notify owner.
If the finder of a thing knows or suspects who is the owner, he must, with reasonable diligence, give such owner notice of the finding; and if such finder fails to do so he is liable in damages to the owner, and has no claim to any reward offered by such owner for the recovery of the thing, or to any compensation for trouble or expenses.

Source: CivC 1877, §1065; CL 1887, §3689; RCivC 1903, §1385; RC 1919, §1008; SDC 1939, §60.0202.