Sorry for the late comments... i understand you haven't proceeded, but a few tips for identifying 67 from 68 cars
i thought maybe the rear panels could have been replaced as they only repro 67 based rear 1/4's, however the front has the 67 fender too (no side marker blinker)
i couldn't quite see in these photos but the rear vision mirror on a 68 is stuck to the screen, a 67 is attached to the visor clips.
the grill is "bolt on" and is 68 style with the ornaments in circles rather than a horizontal bar either side of the centre 'coral' in the middle in the 67.
the chrome trim around the lights - 67 all crome, 68 black pinstripe on the surrounds.
68's had 2 torque boxes, 67 just one.
fuel line runs along the drivers side sill in all 68's, 67 had some on the sill some in the tunnel.
radio's looked similar, however 67 had chrome buttons, 68 had black.
67 have rectangluar blinker lights in the instument cluster, 68 had arrows on the sides to indicate the direction of the blinkers
67 steering wheels are originally 3 spoke, 68's 2 spoke (although not too many 68 wheels are original these days)
these are subtle styling changes you may or may not notice.
can i ask how much he accepted? or just if it was a big drop from advertised price?
long hours makes my head numb... i better leave work soon...