I have a question regarding my canadian work experience. So i started working with canadian company (headquarters:US) as an helpdesk analyst in 2018 at their physical location but due to some reason building was shutdown on jan 2019 and since then i have been working from home for same employer and providing helpdesk support to clients over phone and emails and i have all paystubs and t4s to prove the employement. Now the letter of employment i got from my employer has PO box address not physical address. Do i need to attach letter of explanation? Please suggest