Manufactured Date for 811 ?

[ingramba]

Sorry for the dumb question but how do you tell when your 811 was made? Iv'e checked the box and the receiver and can't find any mark. I got mine 2 weeks ago. The local dealer I got it at always seems to have a steady supply coming in and with all these "shortages" dish claims it has if mine is a newer model he is getting them often, but if it is an older model he might not be getting fresh supply as often as it seems. Just wondering. Thanks for replys! Bill