Neither of those articles mentions fraud at all. In fact, they strive to point out the problem of under funded postal and electoral systems...

I don't see where the postal system is the problem in these scenarios. USPS does not print or count ballots

> “We are aware that some of the mailers may have directed the return envelopes to the wrong election offices.”

Nothing is fraud if you're naive/charitable enough in how you interpret things.

From the article that you posted:

> Ballot-printing firms couldn’t keep up with demand, and the already rickety U.S. Postal Service didn’t move the ballots to and from voters quickly enough.

> I don't see where the postal system is the problem in these scenarios.

>> Patel said his campaign is looking at thousands of other votes that seem to be missing postmarks entirely—a post-office error

Read your own link.

Even if the claim is true, does allowing the post office to half-fail at such a critical time help matters in any way?

A judge has asked Trump's legal team to submit evidence of mail in voter fraud.

https://www.bloomberg.com/news/articles/2020-08-13/trump-app...

It will be interesting to see what they submit.