Before i started with Tunesat ASCAP cue sheets were the only way I learned about placements. It was not uncommon to see cuesheets filed 18 months and longer after a show originally aired.
I normally wait at least 18 months before contacting ASCAP about a missing cue sheet.
I have over 100 Tunesat detections with no cue sheets. Many are Scripps and promos, but more are cable shows. Most of them are for non-exclusive tracks, there is no way to know who placed them. The money is next to nothing so it really is not worth the time going after them for me. I will definitely go after all exclusive tracks that don’t get cue sheets.