Not sure, Colin, but touts aren’t known for reliability.
Last year, there was some kerfuffle involving folk buying tickets that were not accepted ( so I heard, as I was in the course at 9.30am). Apparently, there were some angry scenes outside.
Dunno what’s going on with modern ideas like barcoding etc, but I felt that there were less touts about at Chester this year.
Perhaps, a request for spare tickets though a forum would produce results?