The cache is not at the posted coordinates, however there is a benchmark - AA2664.
You can learn the coordinates for this mystery cache by completing the "City of Falls Church, VA (The Little City) Adventure Lab".You will need a smartphone with data service and the Adventure Lab app installed..
You can install the app by going to Adventure Labs.
You can launch the adventure by opening the Adventure Lab app and browsing to "City of Falls Church, VA (The Little City)".
Once you've completed the adventure, you should have 5 codes: A, B, C, E and F. If you need to retrieve the codes later, you can reopen the adventure in the app, and view the journal entries for each of the 5 locations.
The final coordinates for this mystery cache can be found at:
N 38 52.ABC W 077 10.((E + F + C) - (A + B + C))EF
There is no multiplication involved, just substitute the values for A, B, C, E and F.