How Can I Find/Edit/Delete a Catalog item by using only the ID#?

Took over a ZenCart installation from a guy who died. I have a couple of products that show up when the customer searches for them on the site, and they can order them with no problem. But I can not see them/edit them under the Product Price Manager.

I can create a new product using the same Model#, and of course, a different ID#.

If I type in the Model# under the Product Price Manager, I can only see the newer one. The older, 'hidden' one doesn't show up.

So is there anyway to get to the older one to delete it?

Thanks for any help.
v1.5.1