before taking delivery,
check following things:
Body: check if any scuff, scratch, dent or any mismatch in body and paint of car
if its okay
then
engine bay : check for any changed part like battery etc etc
if its okay
then
interior: check for any scratch on interior check seats , lights, speedo meter, music player , glove box and start the car and check for any warning light on meter
if its okay
then
trunk : check for any repair/repaint on trunk , check for spare wheel and jack
thats it,
all parts can be claimed in warranty after taking delivery but not the paint of car so paint is must check twice before taking delivery.