**Shredding an entirely unused checkbook is a sensible security measure.** Banks themselves recommend it: [Firstrust Bank advises shredding unused checks](https://www.firstrust.com/blog/the-perils-of-check-fraud) to prevent misuse. Destroy any accompanying deposit slips containing your account details too.

Returning it to your bank is also reasonable if they accept it for secure destruction. Ask them to stop sending checkbooks and whether they can disable check payments on your account.

Your concern about a future fraud claim needs a distinction: **securely destroying unused checks is an accepted practice; the exact conditions for reimbursement depend on your country and account agreement.** The bank guidance above supports destruction, so there is no general reason to retain every blank check as evidence. However, it cannot establish your particular bank’s contractual requirements. For example, the [US Office of the Comptroller of the Currency](https://www.helpwithmybank.gov/help-topics/fraud-scams/forgery/index-forgery.html) advises checking the account agreement when a bank alleges negligence and stresses prompt reporting of forged checks.

For reassurance, send your bank a secure message saying you intend to destroy the entire unused book, identifying its check-number range, and ask whether they require its return or any other procedure. Keep their reply.

Continue reviewing your statements after disposal. Destroying the book removes those physical checks from circulation; counterfeit checks can still be created using account information. Report any unauthorized payment immediately.