Border Force Seizure of Replica Destiny 2 Gun

I received a letter from Border Force that they seized a 3D printed, replica Destiny 2 gun. I don't think I can claim it without a permit and I'm fine to let it go but is there a chance I can get into some trouble for attempting to import it?

I have bought one in the past and it arrived ok. Maybe that one was just too fake looking to be a problem. I don't know how to add a pic of the seized gun.