That looks like the real thing to me...
I wouldn't put too much store by the replacement of the round sticker that originally sealed
the figure into the box.
I own many Kaws pieces, and personally I always remove the clear 'seal' stickers from the boxes,
as over time, the adhesive will affect the printed colour on the box... Obviously I make
sure the hologram stickers stay in place...
As I don't own any of the Star Wars Kaws, perhaps someone with a Boba will be able to give you
a more informed answer...
It's definitely a bootleg and not original, just as a FYI. There are several tells that I found out about later. The auction house already refunded my money.