Election workers taking ballot envelopes. Signatures, addresses and all required information to vote in this or the next election are included on these. There is no legitimate reason I can think of to take them and plenty of illegitimate ones. Nothing would stop a person from obtaining a blank ballot and submitting it by drop off. Nobody is checking for anything to validate the voters identification. We know that because so few are being rejected.
Later on, after 5:30, the nice young lady collects even more of these. Note how she stuffs it on top of the file drawer for later collection. No filing required.
UPDATE: THIS IS WHY IT MATTERS. LOOK AT WHAT IS ON THE ENVELOPES