This container is in Blue Rock Park which is open only dawn to dusk.
Posted coordinates are for an information sign about the Little Conestoga Creek Watershed Alliance. There are definitely fish pictures on the sign. Look at the sign to collect the information to find the small sandwich-size container hidden next to a tree close to the trail. Be sure to close the container completely after signing the log.
Container is at N 40 0.1AB W 76 22.XY0
For A and B look lower right:
A is the number of letters in the first word of the common name of the lower trout in the STOCKED GAMEFISH category
B is the number of letters in the name of the macroinvertebrate with the biggest image (most substantial; upper right of group)
For X and Y look upper left at the category of FISH below the Belted Kingfisher:
X is the number of letters in the first word in front of FISH in the category
Y is the number of trout pictures in that category
This is a multi with a field puzzle. But you can check with A + B + X + Y = 21