When using the "Search everywhere" box the other day for the post https://forum.itflow.org/d/1543-bit-locker/8, the search string returned a contact, a vendor, and of course the ticket where I noted the key in question.
Based on this I would guess that a GUID or UUID is used as a key? Based on what was searched, there shouldn't have been contacts or vendors returned. The string 2b51e does not appear in any client facing screen / modal / field.