I still half-suspect that they don't even have a separate bank account for the campaign, and it was all run out of Frank's personal account. With the constant blizzard of stupid John purchases, he probably doesn't even know what the balance "should be" at any given time.
My evidence for this is some of the early filings where Frank made simple clerical errors and got the cash-on-hand calculations wrong by some trifling sum, a couple hundred dollars. Obviously at this point he wasn't trying to commit fraud, but for whatever reason he just let that calculation ride for the next year and never checked it against the bank balance. My theory: it's because he couldn't.
Given how the Wus fritter away tens to hundreds of thousands of dollars on cars and other items that sit around to collect dust or rot, I'm not surprised at this so-called "clerical error." Neither Frank nor Brianna, based on what gets posted here, appears to know how to responsibly manage money.
Whether there was a separate account or campaign funds were commingled with personal funds, something as simple as a monthly bank reconciliation could have brought attention to a balance discrepancy sooner than a quarterly FEC report and subsequent inquiry letter. Again, this gives credence to the idea Frank & Brianna are more skilled at spending money than properly managing it.
That said... $30K is still a lot to go missing, and Frank surely must have noticed that he was typing an extremely large number in box 11. The motive eludes me though, because the money never really existed - it's not like John got to spend an extra 30 grand under the radar. I wonder if this all was an attempt to impress some potential donor and prove that Wu For God-Emperor was a legit campaign.
Alternatively... there is the matter of that outstanding $50K loan from Frank to the campaign. This correction takes them from "able to pay it back" (at least on paper) to "taking a loss". I wonder if there's any advantage one way or the other, again given that the money never existed.
It wouldn't surprise me if Frank felt the SEC reporting form was nothing more than a spreadsheet where one simply plugs in the numbers and sends in the completed form without double-checking any calculations or verifying crossfoot totals as appropriate. Unfortunately for Frank, governmental agencies expect numerical reports to have totals that properly balance, crossfoot, and agree with previous reports (e.g. the previous period's ending balances should match the current period's starting balances).
I'm not sure why Frank didn't check the numbers after the system change to make sure there were no oddities such as this $30 k discrepancy. Given the collective lack of logic in that household, I can't speculate as to how it happened or why it wasn't caught right away.
My feeling is that the loan from Frank is most likely a sunk cost that may never be repaid, so I don't think the current cash balance makes a difference.
Remember they fucked up on their very first report and were reprimanded for it. This is just going to trigger extra scrutiny every time they file something from now on.
From dealing with day job clients, it's safe to say a late or improperly-filed federal or state report can often be enough to garner additional behind-the-scenes scrutiny that seems to last indefinitely. I'd even say that if the FEC didn't have the Wu campaign on its radar before, it most likely is now.
I don't think anyone here is

enough to say that the Wus will take the hint from this recent exchange and start to file correct and proper campaign reports moving forward and deprive us of the pleasure of reviewing said reports for inconsistencies and other significant discussion points.