Well, they've been there for 25 years, probably. It wasn't 50 years old when it was stolen. Ambulances are commonly used in some countries as smuggling cars or getaway cars because no one questions a speeding ambulence with lights on. In less affluent countries, really old ambulences are pretty common, too, since our old ambulences get shipped there when we're done with them.
The body on the Lotus would still be good if it didn't have infestations but would the undercarriage be any good anymore?
BTW, I definitely agree that money could be made parting out, though personally I'd make a quick package deal with someone and have them take the whole thing away.
A lot of those cars do have plates but we have no way of knowing if those plates ever matched the cars. They could be hot plates too.