I'm probably just paranoid right now but.. i bought my dad a canon rebel t1i for Christmas and left it in my closet (which is cold 20-30 F)for about a week in the delivery box and everything. I don't want to open it all and check, could anything have happened to it? Thanks!
Might have condensation build up. Especially if you brought it somewhere warm right after that cold. This happens with my lenses when i take them out with me to shoot in cold weather and then head inside. With electronics, I just stick them in a tub/large bowl of uncooked rice as it supposedly takes out all the moisture. Seems to have worked so far, and my equipment still works.
Friends have dropped their phones in water and after maybe a night in the tube, everything's up and working again.