You may need to check what the automated players are doing to silver in the latest version(s). They tend to be trashing it at the wrong times in advance of copper with bishops and other cards. They are also often trashing it unnecessarily.
*** _Salvager(Plr 1)'s turn 10 ***
_Salvager(Plr 1)'s cards in Hand: [Copper, Copper, Salvager, Copper, Silver]
_Salvager(Plr 1) plays Salvager
... _Salvager(Plr 1) gets +1 buys
... _Salvager(Plr 1) trashes a Silver
... _Salvager(Plr 1) gets +$3
_Salvager(Plr 1) plays 3 Coppers
_Salvager(Plr 1) has $6 to spend and 2 buys
_Salvager(Plr 1) buys a Duchy
_Salvager(Plr 1) buys NOTHING!
_Salvager(Plr 1) draws 5 cards
_Salvager(Plr 1)'s cards in Hand: [Silver, Courtyard, Copper, Silver, Gold]