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Yeah put the key blade in the slot of the lock cover and twist slightly. The cover should pop off revealing the lock.
As far as your spare keycard goes, and seeing as you have a warranty on the car, I'd take it back to the garage and ask them politely to sort it out.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo