The finance report wouldn't show individual transactions. So if you used the credit card to buy yourself $50 worth of groceries, it's likely to fly under the radar. Hacker Dojo does have the general breakdown of their finances publicly -- it's shown every month during their member meetings. However, one could easily hide the $50 in a general group like "janitorial supplies".

When someone embezzles $30k, they don't do it in one transaction. That would be far too obvious. If you space it out over a year, one could make it fairly invisible.