On October 31, 2001, they contacted the Changhe Post Office. Audio file 00720011031.wav.
"Hello, Director Tan."
"Hello. You want to find out who sent this postcard and the address it was mailed from?"
"Yes."
"About that... I'll find the person responsible for the residential communities around Changhe Road."
Tap, tap, tap...
"This is the person responsible for delivering mail to the communities around Changhe Road."
"Hello. Do you remember this postcard?"
"Hm? This one? I've never seen it before. There's no address... We haven't received any postcards without addresses lately. And this one doesn't have anything written on it..."
"This stamp is from the Changhe Post Office. The postcard should have passed through your hands."
"In theory, yes. But these post office stamps... that's not necessarily proof. Someone might have made a fake stamp. I told you before, postcards like this can't be delivered. If someone threw it into a mailbox, the other post office would only put it in storage as unidentified mail. There's no way it would have reached us. It's probably a prank. Otherwise, someone familiar with us made it. Our post office has rules. We can't stamp things randomly."
"That's right. It couldn't have been stamped randomly."
"Then can you find out which post office issued postcards with this design?"
"That, we probably can't find out. Some postcards issued by us can be traced, but this one might be from another province or city, or possibly from overseas. It would be very difficult to trace. Basically, it can't be traced. Our city doesn't have postcards with this design, and neither does the nationwide issue."
"All right. Thank you both for your help."
On October 31, 2001, no matching postcard was found.
On November 1, 2001, they contacted the client's parents. Audio file 00720011101.wav.
"Mr. Shen, Mrs.