[Existence Unconfirmed] Super Mario RPG Plushes

With anything told through word of mouth and not being able to be verified by fact, I'm naturally skeptical of your claim.

We've actually dug up old amusement catalogs in the past that featured Takara plushes (namely the Mario Kart, Kirby's Adventure, and Star Fox sets), and gave the breakdown of characters by case. I assume these were "order forms" for companies to get stock for their arcades, so in one regard yes Takara plushes could be ordered like that.

However, the catalog series that featured these stopped publishing in 1994, one year before the RPG plushes came out. This is why we don't have a set sheet for them and also why almost every other Takara set post-1994 doesn't have a set sheet (Banjo Kazooie and all the Donkey Kong Country sets to name a couple), and on top of that the catalogs were Japan only.

Regardless, I've never heard of 3rd party companies distributing UFO plushes to local stores in the 90s because the plushes were practically new in Japan and there definitely wasn't a market for them here in America at the time. As far as I know the earliest UFO set to be made available in the States was the 2001 Animal Crossing set by San-ei, but I believe Nintendo themselves distributed them to stores so they weren't available to order through a catalog or anything.

Without proof of this order sheet your uncle used I can't quite believe the story since a lot of it just doesn't make sense from what I know about UFO plushes, and whether or not it was a coincidence- stories about people's uncles tend to end up as fake most of the time.