My current SCP idea involves an anomaly that randomly teleports after duplicating people, so I was considering making a document of it while it hasn't yet been contained, but I'm struggling to find existing examples of uncontained SCPs to help guide me. I was thinking of just having two or three known occurrences, in order to justify the lack of any known pattern as well as spare myself the trouble of writing too many incidents.
I also don't know whether I should include the teleporting aspect at all, or just restrict the duplication effect to a single, likely Safe object. Part of the envisioned horror is the possibility of sudden, random occurrence - along with the repeated ethical quandary faced by the Foundation and how they handle it - but I'm not sure whether that would detract from or enhance the main theme of existential and practical crises resulting from sudden duplication.
My last source of uncertainty would be whether or not to give the duplicated pairs a sub-designation (####-A or such), given that one of the primary points of the SCP is that the duplicated people are themselves non-anomalous (and thus indistinguishable). I considered somehow including a reference to a debate about such a designation (as well as how to handle them) in the article, but that might slightly exceed my writing ability and/or bloat the article unnecessarily, at least for the initial draft.