The Cabaltimore Sun (free trial, then paywall)
https://www.baltimoresun.com/politics/bs-md-pol-postal-service-baltimore-audit-20200902-23yhohiebnaw3ipzpgi57qoqpu-story.html
Baltimore postal facility sat on 68,000 pieces of election mail for 5 days ahead of primary, audit shows. Baltimore was in the midst of several contentious political races at the time, including those for mayor, comptroller and City Council president.