Wyo. Stat. § 34-24-136: Agreements to locate property.

(a) All agreements from claimants to pay compensation to a third-party researcher to recover or assist in the recovery of property reported under W.S. 34-24-118, made within twenty-four (24) months after the date payment or delivery is made from the holder to the state of Wyoming under W.S. 34-24-120, are unenforceable.

(b) An agreement entered into after the twenty-four (24) month period provided by subsection (a) of this section is enforceable only if the agreement is in writing.

(c) An agreement by a claimant to pay compensation to a third-party researcher to recover or assist in the recovery of property in the possession of a holder is unenforceable if made within twelve (12) months prior to the scheduled date for the holder to report the property under W.S. 34-24-118, whether or not the property remains in the holder's possession until that reporting date.