tape his toes with the tape for human bandages, I have not had one uncurl on their own,
This is what i have found works for me this year (we hadnt hatched since 2008 and its amazing how much you forget)
cut a piece of bandaging for human skin tape, If you look in my picture what i use is clear with holes in it.
Have someone help hold the bird or be able to hold legs or hand tape, then place the foot out as much as you can in the right shape in your fingers, if you have a fiesty bird Start on the top of the foot, middle toe,
raising each toe stretched out to the tape above it. then when you are happy with the shape, fold the tape over to complete the foot sandwich. be sure and cover all the sticky part of the tape with tape.
I have had a few that I thought there was no way that they would ever uncurl or walk right, but by taping, then checking , then reapplying the tape and then I give them time in my narrow box- or hobbling thier legs as others have had good luck with, I have not had a bird this year end up with foot problems.
But I would work with the feet asap but, that is my opinion, and there are others with alot more experience than I, good luck and best wishes!