I would not contact the libraries. It could be a sale from a RF sight like P5, if you list your publishing info with them. I had a cue sheet filed from an RF site (ProductionTrax) but they split the publishing so it was obvious.
I also have about a dozen TV cue sheets assigned to my publishing. They are all non-excl tracks. I know I didn’t place them, but I don’t know who did either. I accept the extra money because there are likely many cue sheet errors that are not in my favor too.