sorry to burst your bubble, its up to 1917 in uncirculated (UNC) condition. unless the 1976 bill is a really fancy serial number or rare star note, its not worth much more than face value.
I've been a collector for 47 years and a full time dealer for 21. What they said was half truths. The rare not worh serial no 7 which is also a star note is rare and valuable. But the other notes just because they are Uncirculated are extremely common and we spend them. They should do a retraction and correct their mistake.