The fact that you work at an at will state. They'll simply fire you and take their sweet ass time cutting you a check for both your PTO and final paycheck. They don't have a reason to help you at this point, especially when it costs the company more money in regards to insurance, benefits, etc.
When I left my job in April, I had 240 hours of PTO saved up. I asked two Sr. Directors about my options and both strongly suggested that I just bounce. Not being able to stay for 27 more days cost me $12,000 in stock vesting and ESPP bonus. But I had to start the new job.