On the plaque, you will find two dates. (Warning, one date is quite small and difficult to see.)
Add the two dates, found on the plaque, together and divide by 1000.
Add this new number to the following (I’ve always wanted to say this) meaningless coordinates.
N 43 17.019 + _ . _ _ _ =
W 079 50.870 + _ . _ _ _ =
At Stage 2 you are looking for a small peanut butter container, ground level.
Good Luck and Happy Caching