It took me ages to find it too! I began to think mine didn't have one. If you open it up and have the part where it says "Louis Vuitton Paris" facing you, then behind that tab to the very left its hidden near the seam. Hope that helps!
Speaking of datecodes, about 2 years back when I got my pochette (surprisingly it was like my 10th lv bag instead of the first lol) it didn't have a datecode on it. They replaced it cause they didn't find it. I thought that was odd.
