Not in the catalogue

When I was in medical school, every first-year student was issued a skull to study for the gross anatomy course. Each skull was to be discreetly transported to and from class in a sturdy brown plastic bucket. These containers were Tupperware.

I find this interesting. Does Tupperware have a little-known line of medical products, that get no mention on their website or promotions at parties? Did the UBC lab contract them to manufacture a set of burpable, lifetime-guaranteed skull containers? Or were these large food canisters, intended for flour and sugar, that had been cleverly repurposed?

I checked Tupperware's website. There are 133 search results for 'skull storage container,' but none of the items match what I'm looking for.

Free melon baller if you can solve the puzzle.