Each assignment has some way of transmitting a copy of the receipt. Most want a jpg upload or a fax. I prefer using a digital camera because it is easy to edit the jpg if it is too large, too light, etc., so I can be sure that I am sending a legible receipt the first time.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.