Looks like at least some of the valuable ones did though. The json payload is on ipfs, then the image url is ipfs://. Example: https://bafybeihpjhkeuiq3k6nqa3fkgeigeri7iebtrsuyuey5y6vy36n... (they stored an ipfs hash only, this link is just a random viewer pointed at it)

Btw it's weirdly annoying to get the json payload for one of these