Here's a little script I wrote to check package server source for Mac machines. Simply supply the GUID of a package and the script will tell you where the package source is, and the name and current status.

Usage:   pkg-source.sh [package guid]

Example: pkg-source.sh 666F9628-B280-45EA-A923-0651681BAE7C

Package Name:      My Package.dmg
Package Status:    valid
Package Source:   
http://packageserver.fqdn.com/Altiris/PS/pkggroup_%7Bf2b65968-1e6f-46cc-8efd-a38819c485c3%7D/%7B666F9628-B280-45EA-A923-0651681BAE7C%7D/cache

You can then copy the resulting URL into Safari to view the package files. Or see the package name and status as reported by Altiris.