Consider this: the utility that provides the electricity and the ISP providing internet also do not have a direct relationship with Nine PBS, but will be essential in carrying out the court order. Does the judge have to expressly name every transitive party responsible for carrying out the order? Time will tell, but to me the answer seems "no."
In fact, I'd expect you to need a seizure-warrant/distinctly-named-but-to-the-layperson-identical-court-order for my place as, among other things, I don't think I am in a position to legally have standing to challenge an order that's not mentioning me, and lack of me being an active flight risk would probably preclude you from arguing exigent circumstances to secure the dev kit without a judge ordering me to let you.
TL;DR: "complying" with a court order that's filed against a 3rd party is, IMO/AFAIK, a voluntary act, specifically because the party not mentioned in the court order AFAIK has no legal standing to challenge that very order of in court. _Precisely_ because they're not legally mandated to comply, at least not beyond perhaps taking a precautionary legal hold on the referenced information to not get accused of aiding in destruction of data in case the court-ordered party directs the non-mentioned party to delete through the regular customer relationship channels (API? Whatever else?).
Iron Mountain just doesn’t want to be in the middle, and I can see why. OSS went defunct, PBS files a lawsuit, guy buys OSS so PBS pauses, guy now claims he was defrauded into buying it, and somewhere in the middle nobody from OSS showed up in court so there’s a default judgement to turn those over.
I would probably also refuse to turn over the documents without a court order. The whole situation is a mess and the only way to be absolutely sure you aren’t going to get dragged into it is a court order for specific performance.
PBS probably isn’t going to sue them for releasing the docs, but who knows what OSS will do. It doesn’t sound like anyone even really knows who owns OSS at the moment.
I'm sure Iron Mountain will be happy to turn over the data, but to cover their ass in terms of their agreement with OSS, they need the cover of a court order otherwise they would likely be in breach of their contract with OSS