I'm in the US, but our ME tags came via regular mail. We had moved in May and our mail was forwarded and we received our ME info at least 2-3 weeks before we left (it was forwarded).
But, since you are leaving next week, I would think you would have recieved them by now. You should still be able to take ME and use the luggage service even without tags. Make sure you save the tags that the airline gives you when you check you bags. You will have to give the person at the ME counter a description of your bags and they will send someone out to retrieve them off the baggage claim and send them to your hotel.
I would still call and double check that your ME reservation is all set. No previous reservation = no getting on the bus, they don't allow walk-ups with no previous reservations.