The engineering gates in the diagram solve to a series of 0ís and 1ís. When translated to dots and dashes respectively, these numbers can be mapped to standard Morse Code yielding UCR. The log entry for this location refers to an institution of higher education, implying that the destination is the University of California at Riverside. The bugs in the envelope are a hint to look for an Entomology building, of which there are three on campus. The photo clearly identifies the specific building and clue location. 

This clue did not involve nineteenth century Morse Code, as noted by press coverage.

001†    . . -      U
1010    - . - .    C
010†    . - .      R

AND gate: output is 1 if both A and B are 1
NAND gate: inverse of AND, output is 1 as long as A and B are both not 1
OR gate: output is 1 if either A or B is 1 or if A and B are both 1
NOR gate: output is 1 only if neither A nor B is 1
Invert: the circle means invert, 1 becomes 0 and 0 becomes 1
XOR gate: output is 1 if either A or B is 1 but not if both A and B are 1
XNOR: output is 1 if both A and B are 0 or if A and B are 1



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