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I've had that happen with some of my older photos when I pulled the SD card from my old phone and am using it in my RAZR. It confuses the OS and just assigns any old date it wants.
I've had pics disappear from two of my android phones, and all I did was get the quickpic app and they popped right up in that app. After that, they showed up in the stock gallery as well.
They could be deleted or hidden, but do not worry, you can recover lost photos and videos from droid phone with android data recovery program, here's a good one: android data recovery
hope this helps you get back lost pics and videos. Good luck!