FIND might help in this scenario if the clip has unique metadata on it like scene/take or otherwise. The FIND will find clips and sequences containing that. But FIND can also be a bit hit and miss and I have’t done a whole lot with sequences but will take a look at it.
If you know where your sequences are, as in what bins, you can have the bins open them highlight the clip and do a media relatives. Any sequence that uses that clip will also highlight.
Michael