Go into the F.S. Ranger District Office for the area you were in.
Talk to one of the Foresters or Surveyors.
Take you pictures and anything else you have with you.
Those guys get around and may be able to pinpoint the location.
Short of making the trip, try to call the officce and find a point of contact.
You might be suprised how helpful these guys can be if you approach it right.
Good Luck,
Rob.