This exact string format is commonly found in automated or metadata archives where multiple attributes are combined into a single searchable line.
Filenames of this nature are rarely arbitrary. In the mid-2000s—the era indicated by the 2006 date—standardized naming conventions were vital for "scene" releases and automated search engines. -SOD--OPEN-604- ----- 500 SEX 2006-05-04-avi LINK
If you’d like, I can instead:
The most relevant "informative piece" connected to these identifiers is the research titled This exact string format is commonly found in