It's all very human-interest and the-way-we-live-now and a great story, which is why a similar story has been made into a documentary before.
In late 2008, BAM's annual New Czech Cinema series screened Lost Holiday, a documentary in which director Lucie Králová and her crew set out to find the subjects of 22 rolls of undeveloped film found in a dumpster in Gothenberg, Sweden by a Czech vacationer. The photos, once developed, appeared to be the complete vacation photos of seven middle-aged Asian men; the film team analyzed the photos (technically and speculatively); traveled through Scandinavia to the places pictured, to do a little detective work; and appealed to the global interconnected hivemind.
It's not a particularly easy film to see, I don't believe, but nor is its story, apparently, a unique one—I'm sure there are others, too. There's an interesting confluence at work here, of fragile because physical analog technology and the supposedly infinite digital memory machine—but then, people who lose their film today tend to be relatively present on Google.
Old flea market photo albums and their family snapshots retain their mystery, thankfully.