How long would a body be preserved in a sealed coffin in space?

A spacefaring people buries their fallen heroes in space. The bodies are adorned in uniforms (fabric), equipped with the weapons they carried in life (mostly aluminium, steel or polymer, but containing no battery, chemical explosive, flammable or corrosive), and sealed in tough polymer coffins, which are airtight and filled with inert gas. They are then irradiated to kill any bacteria.

The coffins are deposited upon a lifeless moon, or in one of the Lagrangian points around the planet where the hero fell.

How well would the coffin's contents survive the test of time? How far into the future would it remain intact, and how well?

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How long would a body be preserved in a sealed coffin in space?

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