I work on circuit cards and numerous other electronic devices for a living, I am highly trained, and have yet to kill a component with ESD. I don't wear my ESD strap, ever. ( Though my bench has a grounded mat, the bench itself is grounded, and my chair is a special grounded chair, on top of special ESD tiles ). It's probably fine I would say.
I hope so, i googled it and found out that ESD can have delayed effect and show even after months of component usage. Can one be properly grounded if holding painted part of the pc case while working inside, if can i probably don`t have to worry.