Leaving July 6th and just received my ME tags today (6/23).
When we went on the grand opening day of ME (May 5), we never received our ME tags and had to schlep our own luggage. That ended up being a good thing ... at least we had our luggage, unlike the many people who were waiting for over 12 hours to get theirs!!! But, that was the first few weeks of ME ... I hear things have gotten better!
Don't worry if you don't have tags ... just grab your stuff and go to the ME check in desk. They'll ask for your ressie confirmation numbers and will allow you on the bus.
Although we have ME tags for this trip, I am thinking of following my gut instincts and hauling my own luggage just so I know it's there! Do not want to deal w/any inconveniences on my vaca.!