I did searched and checked transaction history, because I found some big transactions that I did not know what were exchanged with those bitcoins, I created this topic.
I don't think tracking the next purchase matters that much to anyone (in the context of future reference needs), the event was just 10k bitcoins for 2 pizzas and that was the only moment the community captured into a celebration.
If you think this is worth knowing and to avoid speculation, afaik Laszlo is still alive and you could do another interview specifically with him about how much bitcoin he spent in his lifetime for pizzas.