Pando Developer Tools

The web service provides static and dynamic package info. One of the two dynamic info constituents is "expiration date, in RFC 822 format; omitted if the torrent has infinite expiration." However, when a package has expired the web service no longer returns the expiration date, rather it omits it (this would imply it has infinite expiration). Since I cannot compare it to the actual date to see if it has expired this leads me to the conclusion that it would be a torrent with infinite expiration, but that is not true because the actual Pando software tells me it's expired. I would imagine that this is a web service problem. I'm interested in this because I have a site where I track Pando packages and I would like to know which packages have expired so that I can remove their listing automatically via my script, but I can't do that because a package with no expiration date is assumed to never expire. Any ideas or is this a problem that has yet to be corrected?