I am looking at the *_management.inc file for a few different assets such as the Redirect Page. Strangely I don't see any assetid attributes. Using the SOAP API to grab the attributes of that asset, I still don't see the assetid attribute
But, the _admin interface shows it right in the Location section on the Details screen. I realize it is using the paintRedirectAssetid function to print the actual asset picker, but it seems strange there is no attribute for it...and not of the assid attribute type?