Oh ya, caps are not to be messed with! even at lower voltages, 300Volts at 1 ferad can cook things in a second if it doesn't just blow up!
All ways keep stored caps with a 1mega ohm bleed resister, higher for higher voltages!
reason I had armor covers on my air vents on my HV supplies, when things go wrong they go "very" wrong.
Most these hv was for making co2 laser, wish I still had some of that stuff, but I had to abandon a great deal when I went off grid, the rest was stolen.
I sincerely hope the thief played with it! pop corn syndrome. Once I get more permanent set up going I want to start rebuilding my HV gear again.