I'm pretty much screwed.
I just talked to the HR person and she said that was the amount I'd be getting, based on the number of months I worked, added up divided and all manner of stuff. Pro-rated, basically.
I told her she told me it would be the full 11 days, not pro-rated. She said "I guess I didn't understand what you meant..."
So my computer will stay on the Sears card that I may enjoy my trip. I'm not screwed, I just have to resign myself to the debt for now...