If, when I was one year old (1983), my uncle had put an 8 track in a time capsule that I could open in 1999 ....
I could have easily played it, since my dad still had his 8 track player. If he hadn't, I could have easily bought one at a flea market, or on that fledgling eBay service, or through a hobbyist magazine - maybe even at a secondhand music store.
I can't think of a single digital format from the past 20 years that is truly in every sense of the word "obsolete" and therefore unretrievable. They may be archaic, you may have to hunt a bit more with some technologies than others to get a working reader, call up some universities, some digital museums, libraries, hobbyist friends, but it can be done.
Even if it can't be done, the schematics for building a reader are out there somewhere. Things are still just made out of elements, aren't they?
16 years is a while, it's not THAT long.