; or (B) any document with instructions to an addressee that the document be returned to the sender or a third party but is not so returned, despite an attempt to deliver such document to the address of a registered voter or applicant, unless at least two Federal election cycles have passed since the date of the attempted delivery; (2) the term voter caging list means a list of individuals compiled from voter caging documents; and (3) the term unverified match list means a list produced by matching the information of registered voters or applicants for voter registration to a list of individuals who are ineligible to vote in the registrar’s jurisdiction, by virtue of death, conviction, change of address, or otherwise; unless one of the pieces of information matched includes a signature, photograph, or unique identifying number ensuring that the information from each source refers to the same individual. (b) Prohibition Against Voter Caging No State or local election official shall prevent an individual from registering or voting in any election for Federal office, or permit in connection with any election for Federal office a formal challenge under State law to an individual’s registration status or eligibility to vote, if the basis for such decision is evidence consisting of— (1) a voter caging document or voter caging list; (2) an unverified match list; (3) an error or omission on any record or paper relating to any application, registration, or other act requisite to voting, if such error or omission is not material to an individual’s eligibility to vote under section 2004 of the Revised Statutes, as amended ( 52 U.S.C. 10101(a)(2)(B) )