“So how does the USPS staff know which ballots are for Trump and which are for Biden if they are hand-stamping all of them to postmark November 3? Are they opening the envelopes or candle-ing them first?
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Good question. Are certain employees handed a batch of ballots to get into the system?”
Are there zip codes\return addresses on envelopes?
See post 49.
Your name is on the outside envelope!
They know who you are at the Post Office by just reading your name you had to sign on the envelope.