That's a great reminder for everyone on this forum who likes to buy vintage and go thrifting. They are not definitely painted with lead (especially the one from the 1980s), but they might be painted with lead. You can get lead test kits pretty cheaply from most hardware stores and you can check to see if your crocks have leachable lead.

This is a measure you should take with any vintage glazed dishes you inherit or buy second hand (particularly those from before 1971 when this began to be regulated), any glazed dishes that you buy through a venue that does not have a robust risk management program to keep them from being sued (that is, someplace like Target), or anything handmade if there is any chance they might be using older glazes.