"A lot of sellers consider them "working" if they move at all. The first few mins after the lava is heated up, it throws up a few blobs. But then it just stays in a mound at the bottom.
Per his listing, he says "inspected and…"
"He said in the ad that he tested them. So yours should work. I would contact him and ask for a refund if it does not work. My lamp shows working photos with the lava in action. What would cause wax not to flow?"
"I got one of those lamps. I will say that 2002 can be a weird year for globes, too. The one I got from that seller (clear/purple) - the lava does not flow. It heats up but does not go anywhere. I've ran it several times now and no action. I had…"
"I've had my eye on some of those. Not a bad price at all with free shipping. That is a USA made lamp. One thing about shipping, at current temperatures lava globes can freeze or at least get very cold. Let the globe sit…"