Really unlikely that anyone would steal your gear. Everyone's got the same stuff and no one wants to carry anything else 10 miles!
And definitely make sure there is nothing food/smell related in the tent. I left what must have been like one M&M and when I got back from the summit, my tent had an entrance AND exit hole, my pack was chewed, and my sleeping bag was... defiled. I would leave the tent open a bit as well just in case.
