Mike,

I am sorry to tell you, but you may have.

If the Nickel lining is still all around, your engines have survived.

Do give them 15-20 minutes of somewhat rich two-cycle running, before checking, to complete the break-in correctly, even though it was incorrectly commenced.

If the plating is in good condition all around the cylinder, you will still have a reasonably long engine life.

As I wrote, OS improved the plating process, to endure and survive the wrong break-in technique...

Sincerely,