This is the obvious issue, you perhaps believe you are, but the reality says otherwise. I'm sorry, but trying to convince people that the mail service has let you down 3 times is preposterous, really, just stop as you are coming across as a child telling stories and the constant "honest, they did, it can happen" line is making it worse. No one is that unlucky and if they are twice they'd REALLY ensure the 3rd time it was perfect.
I'm sure your initial intentions were honourable, this is perhaps why people are not coming down that hard on you, but it's obvious to anyone with a modicum of knowledge of these things that your story is something sprouted out by a person who has dropped the ball and keeps dropping it. My advice for what it's worth is retire from the obvious diversion tactics, say no more on the matter, get it sorted and move on. Constant woe is me responses do you no favours and we can all promise shiny toys, but there comes a time when the person you offered the shiny toy asks "where's my toy" and arguing "it was free, you've lost nothing" doesn't really stack up now does it?
As I say I've no axe to grind here, sort it, put it to bed, move on, don't do it again and bar one or two planet brains it will be forgotten.
