Can you afford to pay it back if you spend it and they do notice?
If you can afford to pay it back then you might as well keep/spend it until they ask for it.I can. I've got about ~2.5k saved for a car, was going to spend around ~500 on a HDTV but I'm now thinking of getting a decent 42" for slightly more and risking it. I doubt it will be in my bank for long though, I'll most probably give it a week.
I like this idea too, consider the interest a gift for keeping it warm for them.Just move it to your savings account for a bit, till they notice.
Thing is, I'm not sure if I'm acutally owed it as where I worked we were effectively always a month behind when it came to wages. I'll just hope and pray.
Or call and ask them...
Why is it ok to keep money that isn't yours? Those saying keep it I assume you'd be ok with people stealing from a shop or your home too then?
I'm just wishful thinking really. 1k to a company that returns 9 billion in profit per year is not much but 1k to a college student is quit a lot.