I remember when we picked up my wife's package/envelope at Puralator, there's no more other envelope inside that is sealed. It's just the passport and I can't remember if she have the welcome notice. And for all here who received their passport with immigrant visa, someone may correct me, but I believe no one receive the immigrant visa packet which what they called long time ago that must be sealed and present to Immigration Officer at the Airport or the Border (if crossing by land border). Everything now is electronically uploaded in their system. Once you cross and activate your immigrant status, you will just show you passport and they will ask where you will be staying. For my wife when she activated hers at YVR, they asked the address where she'll be staying and told her the contact number which is on the file is her correct contact number and she said "that's my husband's number".
Some also thought that IO will ask for the CD of their XRAY copy. My wife have it but IO never ask for it.