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The factory keyless entry code can be accessed 3 different ways. There should be a small credit card with the keyless entry code in the glove box with the owners manual. But if it is not there, which it usually isn't, it should be on a decal on the side of the VSM (Vehicle Security Module) mounted behind the dash on the far right side behind the glove box in the far upper right corner. See below picture. Yours should be similar.
But if it is not there, then you can stop by any Ford/Lincoln dealership and they can connect their scan tool to access the VSM and retrieve the keyless entry code. The factory code is permanent and cannot be erased, no matter how may times you change the code for your personal preference.