I have worked for HR in the past and there are laws that require that final paychecks be cut within  certain time limits or the company can face fines.  I can not remember if it is state law or federal.  What state are you and DH in?  
Also, regarding the owed hours.  What was the timeframe on his paychecks?
What I mean is did he turn in or ok his time for the 1st to the 15th on the 15 and then get paid on the 20th or did he get paid on 15th for  that time and then any adjustments get made on the next paycheck?

Keeker
Fighting the heat in Sacramento