Federal agencies do not print electoral ballots. This theory originated from QAnon affiliated accounts
The claim morphed into: "Dept of Homeland Security (DHS) controlled ‘official ballots’ production. Dems print extras, not knowing about non-radioactive isotope watermarks on ‘official ballots’. Military sting operation. After weeding out all counterfeit ballots, Trump landslide confirmed." However, according to Factcheck.org "the Department of Homeland Security doesn’t produce ballots. That task is handled by local governments which, typically, contract with printing companies to make the ballots."
Chris Krebs, the former director of the Cybersecurity and Infrastructure Security Agency (CISA), debunked the bogus claim on Twitter on November 6, clarifying that the DHS and CISA do not design or audit ballots. Moreover, Jeff Ellington, president and chief operating officer of Runbeck Election Services—the printing company that produced the most ballots in the country this year—told USA Today that the federal government does not have the capability or the manpower to produce personalized ballot for each unique locality and "some states, like California, do have watermarks in their design and all ballots have QR codes to ensure they reach the correct voters. But these vary by locality and are not invisible."