auffindbar
findable
Such that something or someone can be found; locatable.
Der verlorene Schlüssel war trotz intensiver Suche nirgends auffindbar.
Despite an intensive search, the lost key was nowhere to be found.

findable / locatable
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findable
Such that something or someone can be found; locatable.
Der verlorene Schlüssel war trotz intensiver Suche nirgends auffindbar.
Despite an intensive search, the lost key was nowhere to be found.

The word is derived from the separable verb 'auffinden' (to find something). The ending '-bar' means that something can be done. So 'auffindbar' (findable) literally means 'can be found.'
Die alte Adresse ist in der Datenbank nicht mehr auffindbar.
The old address can no longer be found in the database.
This adjective is very often used in negative sentences, usually in the predicative form. Typical combinations are 'nicht auffindbar' (not findable / not to be found), 'nirgends auffindbar' (nowhere to be found), or 'kaum auffindbar' (hardly findable).
Der Zeuge war für die Polizei zunächst nicht auffindbar.
At first, the witness was not to be found by the police.
'Auffindbar' (findable) belongs more to written language or more formal contexts, for example in reports or official notices. It sounds somewhat more technical than other formulations.
Alle relevanten Dokumente müssen für die Prüfung leicht auffindbar sein.
All relevant documents must be easy to find for the audit.
gone / disappeared
'verschwunden' and 'auffindbar' are clear opposites. 'verschwunden' means that something is gone or cannot be found. 'auffindbar' means that something can be found, even if you may have to search for it. So you say 'verschwunden' when the location is unknown and the thing is missing. 'auffindbar' fits when there are enough clues or the thing can be found in a known place.

Die alte Akte war im Archiv noch auffindbar.
The old file could still be found in the archive.
Am Morgen war der Schlüssel vom Küchentisch verschwunden.
In the morning, the key had disappeared from the kitchen table.