Harry frowned and wondered for a moment what he wanted Voldemort to think. He would know about the Elder wand from his babbling like an idiot at the final battle, but not so much about the wand he was actually using. It might just be the thing to lure Voldemort's attention to him rather than Jamie.
He sent his own Patronus back with the answer a moment later.
"Let him know I have it. If he want it, he can come and get it."