$50 limit on anonymous contributions:
An anonymous contribution of cash is limited to $50. Any amount in excess of $50 must be promptly disposed of and may be used for any lawful purpose unrelated to any federal election, campaign or candidate.
https://www.fec.gov/help-candidates-and-committees/candidate-taking-receipts/contribution-limits/
I sometimes “forgot” to fill in all the info blanks...
aging memory, you see...