New message!

So I went to check my mail after lunch today. I guess last time I was in the mailroom I must have left the little combination lock on my box on the last number of my combination, because all I had to do was turn it a little bit to the left and it opened right up - lucky thing, since I forgot my combo! But definitely not safe. Remember to spin your combo wheel thing!

Someone else (Hari??) seems to have also known how to get into lazy people's mailboxes, because I found something weird in there. It was a plain envelope, no address or postage or anything. Over the seal someone had written:

X MARKS THE SPOT

Inside the envelope there were four photographs, which I've scanned for you. Here they are.


Any ideas??? Maybe we have to solve the other cipher first for this one to make sense, but we can probably start trying to figure out what these pictures mean...