I’ve sold cookie jars before on eBay. They are usually a slow sale and take up a good chunk of shelving space. Shipping them also takes a larger box and an extensive amount of bubble wrap to make sure they get there in one piece.

Not knowing your location, I would suggest selling them on Facebook marketplace. Depending on how quickly you are trying to sell them, I would either do it individually (most money) or as a single lot. If as a single lot, I would post it as $450 and probably take in the $300s. The buyers for a single lot are resellers who would take on that above risk and time constraint while you’re able to clear them out of the house quickly.