Return boarding passes?

No you don't. You get your return boarding pass when you check in for your return flight, either at the airport on the day of your flight or online 24 hrs. (on most airlines) before your flight departs.

Keep your e-mail confirmation or printed copies of your e-tickets until you've completed your travel, just in case.

Your e-ticket number is your reservation number that you use to check in at the airport. You only get the boarding passes going one way. Going back, you again have to check in at the airport to receive your boarding passes.

This way, you don't lose your boarding passes between dates.

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