For 480 series there’re 3 nibs hidden behind a lid on the central back. Upon sliding open the lid would be a metallic circle for nib removal. Stick the nib in, pull with an angle, and the nib would come off the pen.
Honestly I can’t believe anyone would have removed all 3 nibs back there before selling the tablet. Should anyone be doing that… they should be sorry for their miserable life, nicking bits and pieces for a living.
OT: Yes they’ll fit.