This is is an envelope with a cancellations for "Launched" and "Returned to Earth" including Kennedy Space Center and Edwards.
Search for "STS-8 flight cover" on ebay.
It's hard to think of a use case.....
These days with the transitive nature of people, islands are going to have boats going to them frequently enough proportionally to the people on them such they can deliver goods cheaper.
Information is wireless, the original reason for rocket mail I assume.
Even reducing it to something sensible like an art project for a Burning man style event, firing a burrito (Search burrito cannons) 1 km away could still knock someone off their bike and hurt them plus it'd be inaccurate due to wind, rising heat, so a pointless project.
You could of course fire vertically, expand out, then glide the delivery in accurately or parachute it down with guidance but you'd lose the delivery vehicles electronics = $.
Maybe pick up, clip in clip out electronics to reuse at the end of the night across town, have a deposit for the buyer and reward for the collector.
But what condition was the mail in? Don't leave us hanging, wikipedia!
It’s funny this actually came up in a comment now because I saw an old ad in a magazine that used a Rocketmail address just yesterday and it brought back a flood of nostalgia.
My very first email was also rocketmail, set up by a friend on a school computer in highschool.
I had no clue what address to pick, so he chose one for me: studhorse69@rocketmail
I wish I was joking.
I’d like to think les clay pool would have taken studbullhecat@rocketmail...
in an amusing way, not for reals.
That said, it’s a pretty funny joke (for high school).
Wikipedia sub-categorizations are consistently amazing. Not sure if it's a positive "amazing" or not, but it does amaze.