I think that reading this sentence as "lost" and "mislaid and abandoned" is not likely. I believe most people would not use comma when they're enumerating 2 categories. E.g. "banana and apple are fruits" vs "banana, apple are fruits".

Serial comma isn't really required [in all dialects], and its use is mostly mandated where it resolves some ambiguity.

In context, with the explanatory sentences following, it's pretty much impossible to misread the idea.

the comma and adding "three" make this sentence worse imo. Don't care what the "proper" grammar rules say