Mid February is when Toilet Paper, Kitchen Towels, Facial Tissues, and Hand Sanitiser disappeared. My understanding is that masks went earlier, but I don't have direct knowledge of those.

There were no purchase limits then, and now every time they're restocked there's a pile of people buying up every single one of them in record time. There's video from my local supermarket of a whole pallet stacked high with toiletpaper being delivered, and disappearing in minutes.