If he indicates that he has such a warrant, ask to see it. A person under arrest or located on premises to be searched, generally must be shown a warrant if he requests it and must be given a chance to read it. Without a warrant, an officer depends solely upon your helpfulness to obtain the information he wants. So, unless you are quite sure of yourself, don't be helpful. If you have any questions that you feel I can answer, I'd be happy to listen to them in my lawyer's office.
Talk is cheap.
But when that talk involves the law enforcement authorities, it may cost you, or someone close to you, dearly.