A collector camera is metal, glass, and often a bellows or a cloth curtain that grows mold in the damp. The number on the body is the proof that it is this piece and not just any one from the same year. In the overview Security for collectors it belongs with the small technical things.
How it gets away
Cameras barely appear in the Radar under their own word. They are still small, and a known brand is recognized by its shape. You do not leave five bodies on the sideboard when the apartment is open for the afternoon. The pieces with a number and a receipt lie in the anchored cabinet.
What time does to it
Damp puts fungus in the lens and mildew spots on the bellows. A leather pouch that is itself damp makes it worse. You store dry, with some air, not in the wet corner of the basement, and you check glass and cloth once a year. Batteries come out of the body before they leak.
The papers
Serial number, lens number, receipt, a photo of the number. The invoice in the document cabinet. One body and three lenses are four lines, not one camera.