I have no idea...my job in this situation is to create the artwork and pdfs, then my client takes care of the rest. A friend of mine also did a very similar job with this client and was able to get it done. The difference here is that my friend had used inDesign, but I don't have access to it outside of college (and my school schedule is already fairly busy), hence why I decided to go with scribus. But yeah, it seems like the printer requires that bleed inside the trim box.