Come on in you three.

Congrats on making it to the final immunity challenge.
Tonight's challenge is called "Lockbox" and here's how it works.

In front of each of you is a locked box with a secret 4-digit combination.
Each digit of the combination is a number from 0-9.
Numbers will not be used more than once in a combination.
All the numbers are in a specific order, so you must get the order right to open the box.
Each box has a different combo.
The goal of this challenge is to figure out the combination of your box in as few moves as possible.

Once you have read the instructions, send me a random 4 digit number.
I will mail you back, telling you how many of the 4 numbers you guessed are in the combination, and how many are in the correct order.
Then you mail me back a new combination.
This will continue until you have cracked the code.
The person to crack their combination in the least amount of mails will win immunity and a spot at the Final Tribal Council.

In case you're confused, here is an example
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(Say the correct code is 7215)

Contestant: 2945

Me: 2 numbers correct, one in the correct order.

Everyone understand?

This challenge begins now and ends at 9 PM EST tomorrow.
I will return mail for as long as I can tonight, but the best time to do this challenge would be from 3-9 PM EST tomorrow.