Interesting. I had never heard that.
Yes. It's but many strange things associated with OKC. The left foot was attached to a left military style boot.
Authorities finally decided it belonged to an airman that had already been buried with a loose left leg (no mention if a boot was attached to that leg). So, they dug up the airmans body and declared the leg they didn't bury matched the body they previously buried with two legs.
Of course, that still left them with an unmatched left leg. Since the previously buried left leg they dug up and removed from the casket had been embalmed, authorities claimed they couldn't perform a DNA match with other bodies that were missing a left leg (no mention if any of the owners of those bodies missing a left leg might have been wearing military boots that day).
What this means is authorities must not have taken DNA samples from the various bits and pieces to begin with.