This happened with me as well.
My last date for paying ebay fees is 15th of every month.
Every month i dispatch ebay's cheque by 5th or 6th of every month, which is delivered at their office by 8th or 9th of the month.
This time as well, i dispatched their cheque on 7th, which was delivered on 10th buy ebay's accounts department failed to update in my account. Even after calling the customer care and getting the case escalated on 12th, nothing happened. On 15th my account was showing "past due" and they charged me late fees.
I never recieved a mail regarding the same even after contactting the customer care and mailing them twice.
Dont know what does ebay wants from the sellers.