It is for mains operation, so not necessary

No, this is a new product and according to our information, the price is correct. :)

When removing paint and varnish with the Bosch Professional GEX 125-1 AE, we recommend using Bosch EXPERT C470 sandpaper with coarse grit (K40-K80). This sandpaper is specially designed for wood and paint work and offers a high removal rate and durability. Bosch Professional accessories EXPERT C470 sanding paper multi-hole for random orbital sanders, 125 mm, G 40, 50 pcs (40)

Sorry, I have no idea, I was also trying to find out the difference, I bought the cheaper version recently and I still have no idea what the difference is. I used it to clean bathroom tiles from lime scale with a scotchbrite pad. It works great, not the most powerful sander though so if you were doing some really heavy duty sanding, maybe something more powerful would be better, but for normal work it should be fine.

No is only in a kartong

According to research, this unit is not designed for polishing and therefore has no corresponding accessories.