Thanks to Ted, I'm now aware of 13 photos of these cars.
Data are presented as follows: reporting marks - reweigh date - color - roof - reference
GA 19712 - 4/54 - BCR - W - MRG 1/87 p15
GA 19580 - ? - S&B - W - MRG 1/87 p15
GA 19682 - 3/54 - BCR - W - CLSC FC v1 p39
GA 19755 - 1/65 - S&B - W - CLSC FC v7 p27
GA 19600 - 10/63 - BCR - R - GA(Hans) p183
GA 19506 - 7/67 - S&B - W - GA(Hans) p184
GA 19715 - 5/61 - S&B - W- FCRM 1 p43, RP CYC 17 p39
GA 19522 - 12/49 - BCR - R - FCRM 1 p43, RP CYC 17 p40
GA 19646 - 10/56 - S&B - W - RP CYC 17 p39
GA 19606 - 12/52 - BCR - W - RP CYC 17 p40
GA 19695 - 7/51 - BCR -W - RP CYC 17 p41
GA 19609 - 11/49 - BCR - R - RP CYC 34 p130
GA 19708 - ? - S&B - R - Culotta blog 6/10/2015
Codes (some are obvious):
BCR - boxcar red
S&B - silver & black
W - welded
R - radial
MRG - Model Railroading
CLSC FC - Henderson (v1) or Maywald (v7), "Classic Freight Cars"
FCRM - Culotta, "Steam Era Freight Cars Reference Manual"
RP CYC - "Railway Prototype Cyclopedia"
GA(Hans) - Hanson, "History of the Georgia Railroad"
There's more than one version of the silver and black scheme: one with the whole side silver except the door, one with black behind the ladders too. Bill, I'm looking forward to your pictures!
Al Brown, Melbourne, Fla.