I use my iPhone to video everything I drop into a post box. (along with a timestamp app)

It takes only a minute or two longer and I was recently able to successfully defend a paypal dispute with it along with the express tracking showing as delivered.

Not sure that the video really made a difference.

I probably would have won anyway since the dispute was opened a few hours after the order was made and tracking info updated in ebay. (pretty obvious scam)

The original reason for doing this was so I could show customers that had slow shipping or lost items that we really did post when we said we did.