Probably depends on your profession and your employer. I assume a a few professions like doctors would certainly need it. However, as an engineer I sent only a photocopied copy of my diplomas. Those were used to send to the immigration office to help obtain my work permit. However, years later i had a chance to look at my personnel file. Even though they had the full cornucopia of performance reviews, my CV...etc. The diplomas were not there.

Makes me wonder why i wasted 5 years of my life and tons of student debt for