(b) The license shall be subject to forfeiture by the licensing authority and the licensee’s activities as a secondhand dealer shall be subject to being enjoined pursuant to Section 21646 for breach of any of the following conditions:

1. (1) The business shall be carried on only at the location designated on the license. The license shall designate all locations where property belonging to the business is stored. Property of the business may be stored at locations not designated on the license only with the written consent of the local licensing authority.
2. (2) The license or a copy thereof, certified by the licensing authority, shall be displayed on the premises in plain view of the public.
3. (3) The licensee shall not engage in any act which the licensee knows to be in violation of this article.
4. (4) The licensee shall not be convicted of an attempt to receive stolen property or any other offense involving stolen property. For the purposes of this paragraph, “convicted” means a plea or verdict of guilty or a conviction following a plea of nolo contendere. Any action which the chief of police, the sheriff, or, where appropriate, the police commission is permitted to take following the establishment of a conviction may be taken when the time for appeal has elapsed, or the judgment of conviction has been affirmed on appeal, or when an order granting probation is made suspending the imposition of sentence, irrespective of a subsequent order under the provisions of Section 1203.4 of the Penal Code.