The Woburn address is a payment processor called Lockbox (previously, this address was in Boston). In order for lockbox to be efficient you need to send the copy of your bill along with your check. They will not be able to process any payments without a bill. This payment will be sent back to us to process. Lockbox does not accept late payments. If they receive your payment late they will send the payment back to us to process. If you have any questions feel free to give us a call.