Trust the Post Office?

I found out that my dad used the Post Office to send in my visa application to the British Consulate. Yes, the visa application that contains my passport. According to the study abroad office, three students have lost their passports when the Post Office mis-routed their packages. God knows how they're handling it. My dad did request a return receipt so at least we'll know if my package gets mis-routed. I've got my fingers crossed.