Retrieval logistics

There’s been suggestions by Grusch etc that crash retrievals are outsourced to private contractors, likely to keep the paper trail outside the realm of FOIA requests.

If the likes of Lockheed Martin and other private contractors do retrievals, how they get access/authority to any site? Surely only the military would have the power, resources, and ability to track the trajectory of any crashed AAV, identify the crash site, secure it, prior to calling in contractors?

How often to crashes/retrievals happen? Maybe once in one or two decades? Unless the military are able to keep a precise track of everything in the skies and rush to a site, then it’s as likely that they could crash anywhere and any civilians could find them.

If they’re not on top of it, they’d rush to the site of every meteorite hit.

And if these crashes have happened presumably throughout human history, why have archeologists never come across crash artefacts? There’s a way to secure proof!