On the case back there is a # D2471/2500 that matches the piece of paper but I could not find any other # that matches back the cert , it is unusual ?
The numbers that you should be concerned about are:
The case number: OP6562 - Is it correct for the model and series, i.e. PAM00025 D series matches the sticker and case back
The Serial number of the watch: BB1042487 matches with the sticker and case back
The Millesimation of the watch: D2471/2500 - which is correct as only 2,500 PAM00025 were produced in 2001 and matches the sticker and case back.
The movement number: 230234 - which matches the number on the sticker and COSC and the caseback sticker.
Although these are not conclusive, but it does point in the right direction.