Yoou're in the wrong forum and a google search would've found this:
Unlike traditional numbered locks, the lock of the briefcase employs a four-letter word as its key. This puzzle is one of the few in the game that have randomly generated answers, and as such there is no absolute answer. The process of finding the answer, however, remains constant. Within the same room, on the bed adjacent to the briefcase, are a mess of scattered photos. One of the photos is marked with black marker, presumably emphasizing its importance. The photo, in truth, depicts the briefcase with the four-word key entered on the lock. In order to view the picture, James must use the Thinner obtained earlier in the Basement elevator of the hotel. Once the thinner is used, the photo now shows the randomly-generated word that unlocks the briefcase.
According to this guide, it sounds as if the code for the suitcase is random. You'll have to use thinner on the picture in order to locate the code.
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