We sent out invoices on July 1st. One customer we have is always good about paying on time. In fact her check is the FIRST one in the office. This month I sent the invoices, went to Tennessee for a weeks vacation ( much needed) come back and all the checks except for hers, and one that pays this week ( because it's a commercial account.) I corner the lady yesterday and asked "Where's my money?" ( did ask in a nice way) She was Shocked by my asking, she says she sent it out on the same day she got the invoice. I believe her, because she has never been late and like I said earlier, she is always the first one to pay. Any suggestions on what I should do. All of our Accounts are net 15 days. Today is the 15th. It may be lost in the mail, but who knows...? All of todays technology and the us postal service still can't track anything. Why is this? UPS don't have a problem tracking their stuff!