For sure an interesting find, but was kinda hoping based on the title that there was a more straightforward way to do this.

I really wish that AWS had a simple way from an admin account to ask "where is X resource" within an organization to quickly tell me which account has a specific S3 bucket (and other things, but s3 buckets is the big one).

Admittedly this is mostly an issue with legacy buckets that existed before better practices and buckets all being defined in code. But with a ton of AWS accounts it can be tedious to hunt down a resource in an unknown account and possibly region.