I had a look at the Wayback Machine for my site, it was archived 4 times over a two week period last June, but not again since so in my case I don't think it would be any help if I was in need of evidence. But thank you, I don't think I have anything that anyone would want to copy, but it is as well to be informed.
Yes, it's crawling seems to be rather spastic.
However, if you've not done so, you might try another look under a different canonical form. Ditto for any URLs re-directed to current pages.