in December 2017 I received Qantas lounge passes from Bank of Melbourne credit card and I cancelled the card a few days later. Note, these were not electronic but paper-based vouchers. I redeemed them successfully last week in Qantas Sydney lounge.
These days the passes are electronic so I can’t be 100% sure but they are rewarded for each year you were the holder of the credit card so they should stay valid till their expiry date.
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