I have 2 folders on computer. When I order something, I put it in 'transit' file. Also the company's confirmation email and anything else they may send. Once received and checked, I move one of the emails (with the item info) to 'orders' file and delete the rest. That way I have a record of the item number and other important info in case I want to reorder it. And a quick look at the 'transit' file lets me know what it outstanding.