These are not easy to find. Contact law enforcement. Insist on getting a case number and attempt to get a report filed and get a copy of it. Create a standard cover letter with all important information that you can revise for each. Affidavit of Forgery A notarized affidavit of forgery is your statement that you did not authorize use of your check.
Banks are pretty straightforward.
The check service company may not be. Some of them make the procedures clear, others make them deliberately hard to follow. A copy of the police report. A copy of your driver's license. Lessons for the Future Do not carry checks.