Mo. Rev. Stat. § 328.025: Duplicate license, issued when.

If a license issued under this chapter has been destroyed, lost, mutilated beyond practical usage, or was never received, the licensee shall obtain a duplicate license from the board by appearing in person at the board's office or mailing, by certified mail, return receipt requested, a notarized affidavit stating that the license has been destroyed, lost, mutilated beyond practical usage, or was never received.