That is a good account of the removal, thanks for sharing.
Those locks keep honest people honest.
This inexpensive bolt cutter is a quick / easy / quiet way to open that lock.
The
DeWalt 4½" Right Angle Grinder that I have in my tool set would cut through that very quickly. It is loud w/ lots of sparks. They have a battery-powered version for those who like cordless tools. I have used this tool for many projects and it never disappoints. I have the myriad of wheels for different materials and operations for maximum versatility, for steel, stainless, aluminum and masonry.