There's been many such cases, and such scenarios are especially plausible in Kashmir, which is not only remote and mountainous, but the principal region of contention between India and Pakistan.
However, modern technology has also made it more difficult for mother nature to conceal aircraft debris, especially if you look fast enough (e.g. before vegetation or snow sinks in).
Once an enemy aircraft is downed, ELINT and/or SIGINT data should give you a general location of the wreckage. From there, you just need to task some spaceborne assets that are otherwise employed to identify and monitor forest fires to locate the flaming debris.
Even if you get rained out, you'll probably find something so long as you're in the right neighborhood and looking hard enough.
Private individuals and entities can pursue similar approaches for geolocating attritted airframes, granted their starting points will probably have to come from the metadata of photos or videos capturing the wreckage or something else more lawfully and publicly accessible.
Like Pakistan's principal adversary, India, Turkey's principal adversary, Greece, also operates the Dassault Rafale.
So are you implying that Turkic and Pakistani air forces have been exchanging notes on and sharing ELINT data from Rafales?
So are Pakistanis as ungovernable as the finest 2nd Amendment loving American "rednecks" and "yokels" of Appalachia, the Deep South, Idaho and Texas?