Pretty sure destroying evidence is a crime but I’m not a lawyer.
Generally speaking, document destruction is not a crime.
Obviously there are exceptions to this. Court ordered evidence preservation for a case, for example - but no crime there other than risk of contempt of court, which is technically not a crime.
My guess is that the election documents have a legal preservation period, so that destruction before that period is unlawful. It is typical for laws that "order" government conduct to carry NO criminal penalty. It's just unlawful to do such and so, but if you do, no criminal penalty.