Lol, I've like many others have bought pull down in containers like plain metal varsol cans, white and black plastic jugs, 32 lb drums and a few times in brown grocery sacks. Some of it was was bought for $3.00 a pound. These are every bit of 30 yrs old. When I bought them I took a sharpie and wrote on the label and one the can what was in the can.I would not use that because you have no idea what's in it. What if the person maked the container wrong?
For instance it's supposed to be like Accurate 1680, but the powder that was put in the container is say something like Titewad?
I'm pretty certain just with pulldown #8 I can learn what data to use.
Jeff Bartlett or the McDonald bros is who I would ask first.