Silvered weapons no longer appear in the PHB. Do you think they've been removed, or moved to the DMG?

Silvered weapons, or how to silver a weapon, no longer appear in the PHB (neither the Weapons section or the rules glossary).

The imp also no longer has resistance to BPS damage of any kind, so the reference to its resistance being bypassed by silvered weapons isn't present.

Do you think silvered weapons have been removed from the game?