Spies can be so indiscreet. I once worked for a chain of gyms that had corporate deals, i.e. employers would pay for the subscriptions of their employees. As it was the Brussels area we had such deals for law enforcement, government, multinationals and embassies. The condition was that the new member had to prove his place of employment with a payslip or other document. One Spanish diplomat managed to bring a copy of a certificate with his name that said "Top Secret"