30cal M1 ball ammunition

Hi, folks. I’m new to this forum but it looks like the place where I can get a couple of questions answered.
A customer brought me a sealed can (spam cant ype) of 30cal ball M1 ammo. 600 rds in 10 rd clips, bandoleers, with lot WRA 22753 also on the can. Can is in great shape with key still intact, OD green of course with yellow printing. I suppose it has value as long as it isn’t opened but I can’t find out how much it is worth. It is not for sale at this time. But I can’t find a value. Any help out there?Thanks