That was that article....
The county, noting that there was an obvious discrepancy in the 313,000 counted mail-ins and the 348,485 it said it has received for this election, said the reason the warehouse isn’t counting those on Thursday isn’t because they’re taking a day off, but because they aren’t permitted to count the rest of them without undertaking the legally-mandated process to review them.
... the post-gazette offered only that Allegheny finished their counting by the next night...
Pennsylvania's second-largest county finished tallying the last of its mail-in ballots on Wednesday shortly before 10:30 p.m.
Allegheny County spokeswoman Amie Downs said a final batch of 5,556 ballots was uploading to the website, bookending their count of more than 310,000 in the past two days.
The county warehouse on the North Side is now closed and will remain closed Thursday to media and observers, as the elections divisions staff will use the day for administrative work.
Shortly after operations at the warehouse ended for the night, Allegheny County Election Division Manager David Voye said around 10:45 p.m. that they've scanned approximately 668,000 ballots in Allegheny County from the past two days that include around 313,000 mail-in ballots and 340,000 in-person ballots from Election Day voters. Mr. Voye added that there was a 70%-71% voter turnaround.
... no other articles regarding that county from that newspaper about stoppages.