There are procedures for auditing counties can have, paper ballots have barcodes which must be unique or fit a pattern. If voting machines have printed receipts (the only sane way to do electronic voting afaik) the printed receipts can also be tallied and must be unique. If there is no paper trail, you can still check the voting machines and databases for any tampering with a forensics/security team in case the manufacturer is a complete idiot who hasn't provided enough security.

Given the amount of hacking that has gone on during the election, to influence the election, it is worth investigating at some level for a sanity check. The kind of targeting required though would mean the Russians had to have the best polls out there. Targeting few counties in WI, MI, and PA, (and OH, FL, AZ) enough to tip it to Trump in a electoral college big-way? Doesn't seem too plausible, but I'm no spy.