Redhawk, you have similar luck to me.  One trip I shot a caribou about 3/4 to 1 mile from camp, with some mucky tundra to cross.  And  it was only about 4 weeks after my appendix surgery.  The rest of the group took caribou within 50-400 yards of camp over the following days. Then the caribou disappeared.  We had seen 100's on the flight in.  We saw 1 on the flight out.  When they leave, THEY LEAVE.
Good luck.