Haha, I just noticed

Well... I was able to change the street number on a parcel (after making a typo on an online order page which resulted in a failed delivery, mind you) by simply sending an e-mail to the shipping company (Purolator in Canada), and they didn't even check my ID or ask for any proof, even though the street number changed from 1388 to 3015, heh...... This is dangerous when you live on a major avenue in a city with a population in the millions like I do :/
That's why I'm a bit paranoid when it comes to shipping numbers now :S