To be a memory that never existed

In case you wish to be completely forgotten it's necessary to know how human minds react to memories.
It's possible that one might still stay embedded in faint memory or that a random unrelated incident might trigger a particular recollection, thus rendering chances at being completely forgotten a magnanimous failure.
So to be a forgotten piece of nothing it's important that you play your strategy right by being a part of museum installation.

The thing with museums and being a part of sculpture behind glass is that they tend to become inconsequential to the naked eye.
True, there will be a thousand visitors to the museum, looking at your sculpture and reading your description, but the mundanity of the activity gets to be so boring and the thousand sculptures of important history so tiresome and overwhelmingly many that almost everything is muddled beyond recollection.
Add to that the insipid coolness and reinforced silence that comes with museums; where every visitor is trying to look interested in ancient history, tourists with audible headsets quietly sauntering along picture to picture statue to statue sculpture to broken pieces of similar ruins.
One needs just one bored seemingly interested tourist to yawn and a chain reaction is unleashed.

Each gallery a dedication to certain era. A certain style where everything begins to look the same two minutes after walking into a museum. Add to that the deluge of information scattered in every breath of living space in museums. Important stories, informations, era's, year of discovery, excavations written with such abundant sincerity that everything's a mishmash that begins to fade as you struggle to keep your eyes open, and look forward to each exit, only to get disappointed because you've entered another gallery of similar fossils.

The trouble with museums dedicated to a singular civilization of a particular timeframe with the same kind of ruins is that they are boring and in that jadedness are you to install yourself, chances are that you'd be forgotten to the point of oblivion.