Conn. Gen. Stat. § 9-153b
(Formerly Sec. 9-142). Additional ballots.
(b) For all absentee voting sets or portions thereof returned under subsection (a) of this section, the municipal clerk shall mark the serially-numbered outer envelope “rejected” and note the reasons for rejection on all absentee ballots and envelopes so returned and shall seal all such absentee voting sets or portions thereof in a package and retain them in a safe place until delivered in accordance with section 9-140c . The municipal clerk shall keep a list of the names of each absentee ballot applicant who has applied for more than one absentee ballot, as provided in section 9-140 , together with the serial number appearing on the outer envelope of each absentee voting set issued to each such applicant.
(c) If more than one absentee ballot is received from any elector, the ballot of such elector last received by the municipal clerk shall be counted if no absentee ballot of such elector has already been counted. For all absentee ballots of such elector that are not counted, the municipal clerk shall mark the serially-numbered outer envelopes “rejected” and note the reasons for rejection and shall deliver such ballots in accordance with section 9-140c .
See Sec. 1-2a re construction of references to “United States mail”, “postmark” or “registered or certified mail”.