I would hold them up to the sunlight so I could see into the bottoms , not the end against the divider, but the part f the cell that is on teh bottom when in the hive, and look for dark scale from AFB.. if it didn't have that I would use them...
I would clean up the wax moth refuse and make sure there were no live wax moth larvae..
this is based on the NEED for drawn comb if you are splitting, have more bees coming etc.. If they were just free frames then go with Blue's suggestion.
At three to five years they get good and dark. The color isn't what bothers me, its the stuff that collects in the wax the comb is made of I worry about.