Wash. Rev. Code § 63.30.070
(1) Subject to RCW 63.30.120, property held in an account established under a state's uniform gifts to minors act or uniform transfers to minors act is presumed abandoned if it is unclaimed by or on behalf of the minor on whose behalf the account was opened three years after the later of:
(2) If the holder does not send communications to the custodian of the minor on whose behalf an account described in subsection (1) of this section was opened by first-class United States mail, the holder shall attempt to confirm the custodian's interest in the property by sending the custodian an email communication not later than two years after the custodian's last indication of interest in the property. However, the holder promptly shall attempt to contact the custodian by first-class United States mail if:
(3) If first-class United States mail sent under subsection (2) of this section is returned undelivered to the holder by the United States postal service, the property is presumed abandoned three years after the later of:
[ 2022 c 225 s 204.]