So, thanks to
@Ajk for sharing this trick for showing 3 years worth of Ebay sales, a little while ago.
1. Go to eBay
2. In the upper menu bar, click "Sell"
3. If your account isn't a sellers account, you may have a step to approve a change. There isn't any fees or new info requirements.
4. On the Seller's Hub page, hover over "Research" and then select "Product research"
5. Enter your search term. This is important to get right
I searched "Ariel and Eric Framed Jumbo"
I got several results, but it looks like there was an alternate version from a D23 Expo which was LE150 mixed in. But there are 3 sold that have LE500 in the title. The last in Oct 2023. Using that search string, and including description, I also found 2 fully framed currently for sale.
In general, I would say few sales doesn't usually mean "lack of interest" as it does "lack of supply." Like previously implied, many of these are probably in people's collections and not trading / selling stock. Although, it could also mean the ones that are available are priced too high for the current market.