One little-known fact about ESD damage is that it's rarely fatal straight away. Zap a chip with static and chances are it'll carry on working perfectly well for a while, but then it'll fail at some later date when the product is in service.
In one of my previous jobs, I was the hardware guy in a room full of software engineers. Periodically people would come to me with boards and ask me to fix them, saying they'd "just stopped working". The faults were random.
We were developing embedded PC cards, so they were handled frequently, and the room was an ordinary office with regular floor and furnishings. I suspected ESD damage.
So, I argued and fought, and eventually got the go-ahead to equip everyone with an anti-static mat. I bought a big roll of the stuff and cut pieces to fit all the engineers' desks, and made myself thoroughly unpopular by going round fitting the mats and handing out wrist straps, with instructions to use them every time they handled a card.
It was a real uphill struggle to get it into the heads of the engineers that the way they handled boards on one day could cause them to fail some time later. They didn't get it at all.
But: I *never* received another card that "just stopped working" after 'ESD-day'.
Could just have a regular good quality breadboard with lots of grounds stuck into it's unused planes... and work with it on an esd mat.
Sorry, couldn't resist this one - it's the ESD equivalent of walking into a clean room wearing muddy wellington boots.