Is there some mechanic around who knows where Boeing is putting the serial numbers? Looks like the fittings are torn off, it would be real bad luck if that is where the serial number label is attached...
The other numbers floating around here are access panel numbers, nothing to identify the specific aircraft. Access panels are removed frequently and lie around by the hundereds in the workshop, hence they all have (systematic) numbers.
It´s a serial number which could make all the difference between a piece of scrap and a piece of evidence...