Do I need all three of my T4 s to get my taxes done?

I always take my taxes to H&R Block. The first time that I ever did my taxes, they pointed out that I had a T4 that I had never received in the mail due to a change of address and me being unaware at the time that that was an issue. They were able to locate it without me having a physical copy. However, this time, (a few years later) I had three different jobs throughout the last year and I have not received all of my T4 s yet. Seeing as I can t let my current location be known by anyone that could relay it to that old boss, (domestic violence issues) will H&R Block be able to retrieve that T4 when I take the other two (that I DO have) in?