I've had problems with this in the past too. (from the UK). When people send me coins from the UK I often recommend that they describe them as antiques or collectables, so that if they go missing you get the proper money back. It's ridiculous that coins are't covered, that rule should apply to current money only. I don't know if it's the same for special delivery. In the mean time, lie through your teeth...if it goes missing then how are they ever going to know the package contained a coin?