Yeah that's a fair point, I agree that vacuuming definitely has it's benefits. Only need to have something with a little weight fall on it during transit and POP. The postie would be all over it, let alone the dogs. But assuming the package stays in tact, the vacuum itself won't directly contain the smell, although it will certainly help towards being burst open by pressure.
But you know that. This was more for those who securely recieve a package but start pranging out because it wasn't vacuumed, even if triple packed in heat sealed mylar etc.