I meant the parachute size or type is irrelevant to advancing the case.
Now, having it checked by a rigger is a big mistake. DO NOT DO IT.
Cooper pulled the card from the pocket and replaced the other card.. His DNA may be on the card or the edges of the pocket..
What should be done is the back chute card and pocket area is sampled for DNA... of course there are other people who have touched those areas. Cossey, Hayden, Reno chute inspector, rigger who repacked it and maybe FBI agents.. Still, probably fewer than the tie and you don't need approval of the FBI.. just the museum.