I thought I’d update this thread with my own experience today. I fabricated a bullet tray from something else that was plastic and painted it with Rust-Olium 2X primer/paint in Oasis Satin Blue. This is my observation: it’s close, and it’s a near match for the plastic boxes the Dillon conversion kits and dies come in, but it’s a fair bit lighter than the color of the press itself. Perhaps the press really is painted in old Ford motor Blue: