Hit and Run

A witness took a picture of a hit and run accident, and the middle 3 symbols are visible, as shown below, but the rest of the symbols are blurred.

The witness knows that a license plate has 3 digits and 3 uppercase alphabets in that order.

The police went through their database in hopes to identify the culprit. What is the average number of they need to search before they can find the actual culprit?

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