Mine did and I got an email about the county receiving my ballot whereas my wife didn’t have one or the barcode and they haven’t gotten hers, or at least they don’t know they got it.

From the PA Dept of Stste site, “The outer envelope includes both a unique correspondence ID barcode that links the envelope to the qualified voter’s application and a pre-printed Voter’s Declaration that the voter must sign representing that the voter is qualified to vote the enclosed ballot and has not already voted.“