I guess they just couldn't pair up the parts in transit but both had the ship-to address so you got them delivered separately. :)
There was one package I sent (quilt pieces for DBL, a note on my business letter head & a small amount of cash to help with costs on the other end) that apparently lost its packaging, but all the contents remained together somehow.
I got an email from the PO it arrived at, about an hour from its intended destination, and the very nice postal worker said she'd gladly send it where ever it was supposed to go. It arrived in less than 2 days later including the cash..... woohoo!
Normally the ship-to address would have been on the enclosure too, but this time it was just a personal mailing that I had written a note on so it didn't say "ship to" anywhere. If it had, I'm betting it would have just arrived in one of those bags. A nice confirmation that including a detailed receipt is not just a waste of time.