There are a couple doubles and triples of a few bomys on Graal 2001.
The rarest bomy would be the one that has never changed hands ever, and only one has EVER existed on Graal 2001, meaning there are no doubles and never have been.
Sarma and Ambient fall into this category, and I'm not sure about Birce 0 since I know Antago owned it, but I dunno if there were any doubles.