In the days of buying VR at CVS I was using a car key instead of a coin to scrape off the stuff that obscures the PIN and scraped off enough of the PIN that I couldn't read it! Eventually I was able to get them to give me the code but I had to fax in my DL and other info first which was a pain.

I had a VGC slip out of my pocket and into the couch I was sitting on but luckily one small corner was peeking out. I would probably haven't ever known where I lost it!