IRD file not available on website listed in Quickstart

This game is disc-only. I also don't have a modded PS3 or one I could mod. The last one I had died, and I prefer to keep my new slim PS3 unmodded. Too much of a bricking risk, and the only modding option for slims is something over the internet.

I actually might have the IRD for it already, I just don't know the region code (BLJS-XXXXX). I just needed to know another way just in case I don't have it.