ATM when I make new anvil, old are lost it value.
And will stored in some remote corner of my claim.
So for other metal things.
It will be good to have ability to recycle old metal stuff.
For example add action to turn any metal tool to metal scrap (with some downgrade of quality from used metal).
Scraps then can be placed to smelter and smelt in metal bars.
So for anvil, cauldron, plow, etc - bash it to some scrap pieces and smelt them to bars.
So we will not have big row of old anvils in late game,
but will be used recycled metal from it for some useful stuff, as metal cabinets and mine supports.