Yes, Casper Suite uses the physical name of the package as its package receipt. This is different than what the built in OS X installer uses. If you look at the Installer.app/SWU tab those are all in the standard reverse URL style bundle identifier format, assuming the package contained that of course. Packages built in Composer may not have a proper bundle identifier, but its possible to set one if you turn down the arrow and click on the Info.plist file. There's a field in there for setting a Bundle Identifier. By default it will be the file name without spaces or with special characters removed.
