I hope it turns up.
Cards notoriously go missing.
Mainly because some scum think they might have cash inside, from some nice granny.
Worth reporting, as they might be able to work out who did it, though I fear it probably won't mean Reece gets his birthday money.
You aren't really supposed to send cash through the mail, although lots of us do.
If you are going to do it, send a card, and post any money disguised as a letter seperately.
That's what my gran ended up doing when I'd moved away, and similar things happened to cards she sent. Cards are much more likely to go 'missing' than letters.