evidence: Some commenters saw the lack of a seal on Biden's letter as proof there was more to the situation than meets the eye. [...] The implied claim is wrong. There is nothing unusual about the presidential seal not appearing on Biden's withdrawal letter. It has been consistently left off letters and other material released by his campaign, as was the case here. [...] Biden's letter does not include the presidential seal, but that's not at all unusual. It was posted to his campaign's social media accounts, not his presidential accounts. The lack of seal is consistent with other letters released by Biden's campaign, including one earlier in July. The seal has repeatedly appeared on letters and other statements posted to his presidential accounts.