The lockboxes pick up our payments several times a day from the post office boxes and deposit the payments into our account. Each lockbox makes deposits into our account up to 6 p.m. each day Monday through Friday. We post the payments into XOMS the following day using the date of the deposit. The lockbox does not hold payments. It may be that the check is not made not to IPU and is in the process of being sent to the office here in Wayland. It may also be that the customer did not mail the check on the date that they gave you.