I only send in my lens only as it cannot auto focus in Live View mode in the D5300 when the camera was first released. I send it just before Chinese New Year and it took one week because of the holidays. Maybe you can call them for more details that you want to know.
Went to Sigma service centre today for focus recalibration, now the lens is super sharp. Took 3 hours or so.
Thanks for the help bro