Agreed. He doesn't say the serial number but lists the ICs including the date code on the compander (8225). There's usually a very short time (1-3 months) between component production and pedal production so this DM-2 is probably from early 82 and will have a serial number around 16xx00 - 20xx00. That's about one year after Boss stopped using silver screws.
I really don't like it when people are trying to hard to rip other off. It's one thing not to know about it and give as much information as you have but it's another thing to be so dishonest.
yup and people that dont know the difference will be like "NICE! and its silver screw too." trust me. theres people that dont know this isnt authentic and will pay extra.