I am a teller at a bank. I lost my blank card due to a work error. I would like a letter of apology for my mistake. Thank you.

Dear leader, I lost the blank card due to a work error, and I deeply apologize for the impact on the bank. Reflect on the lack of seriousness and carelessness in your work. I will use this mistake as a lesson, always push myself to correct my shortcomings, treat my work seriously and responsibly, work hard to overcome the shortcomings of recklessness and carelessness, learn the business and strive to better serve customers.