Alot of the questions go to what effort did GameFly invest into research, planning and execution, of the shipping and return process.
Things from the material the mailer is produced from to simply how the dvd is secured inside the envelope to prevent shifting through the sorting process.
And the really big question, are you sure they really were "stolen" and not just kept.
I think pretty much all of the questions are valid and while written in legaleze, quite understandable given the severity of the complaint. If GameFly worked with the USPS in planning the mailing portion of their service and co-operated in tracking down these "thefts" before filing this case, then they should have no problems answering every one of them honestly and fully.