Even if it's OK today, your camera may start doing it tomorrow.
Don't worry about it. If you look hard enough you'll always find them.
DON'T return a camera because of hot pixels. The replacement will, too, over time.
Likewise, don't bother hand-picking a camera. I used to do this, and even the ones I picked as clean eventually picked up some hotties.
Sensors are analog, and as you analog circuit designers know, everything matters. Over time hot pixels will come and go. They won't move, but their intensity will vary.