They are ivory chips. Whether they are from Canfields, I doubt it. I do see that Dale attributed two chips from Canfields

That set of 4 chips show 3 $1chips and one $25 chip.

A set would have 1 (not 3) $1, 1 $5, 1 $25 and probably a $50 or $100 or both

Three different ones is possible but I highly doubt it

Dale’s attributions, in many instances, are good guesses, that’s it.

For example, I own a rack of ivories. 25 years from now, someone might attribute the chips to me, not knowing I bought them from someone else who may have bought them from someone else. Har to attribute ivories. Although some have been, in my opinion, accurately attributed.