A proper bummer indeed, I just checked the int. parcel tracking site, and it says delivered @ 10:30 AM.
It's a shame that it's so long ago, but despite the fact that a signature was not needed, I know for sure that it's being scanned at delivery, and that must be in the system.
I don't know if RM has the same lousy CS (used loosely) as their Dutch counterpart, but you might want to check if they can fill you in on what happened, and where it went wrong.
All parcels are being tracked, so the trace must end somewhere, that's no rocket science.
John, I'll send you the link to the T&T site, so you can see the events, I could also post it here, but your personal details are visible, so that might not be such a good idea..