It seems that a very few, but a few is a few too many, badges are getting bent pins within the machinery of the Mail system. To avoid this I suggest you put a small amount of bubblewrap inside your SAE and that should cure it.
Now something I am going to share - 'cos I like it!
"Pancake", one of purchasers of the badge, sent me a request addressed to The PPRuNe Fund at the normal address. The Royal Mail, in their infinite wisdom, decided, quite rightly I suppose, that the PPRuNe Fund does NOT reside at the normal address - and promptly returned his letters. He contacted me by e-mail and we sorted it out.
Got his request to-day, and I have sent him his badge.
A comment in his letter goes thus:
"Maybe the Royal Mail can only navigate VFR and anything involving IFR totally defeats them....!"
Cheers
IFR