Yes, it is possible to track a mailed check. Here are a few methods you can use to track your mailed check:

1. Contact the postal service: Get in touch with your local post office and provide them with any relevant tracking or reference numbers associated with the mail. They may be able to trace the whereabouts of your check or provide additional information [1].

2. Use USPS Informed Delivery: If you are in the United States, you can sign up for USPS Informed Delivery, a free mail-tracking service provided by the US Postal Service. This service scans your incoming letters and sends you alerts for all new mail, including checks. It also provides images of the front of letters so you know exactly what's arriving. Informed Delivery can help you track your check directly to your mailbox [2].

3. Check with the sender: Reach out to the person or organization that sent you the check and inquire if they have any tracking information or if they can assist you in tracking the check.

Learn more:

1. How to track down a check that has not arrived ... - Quora
2. How to Track Your Paper Tax Refund Check That's Coming in the Mail - CNET
3. USPS tracking | Circuit package tracker