As I said already in post #7 you likely won't find any silver on paper plates.
In case there is, the the amount to be taken up from them will be small, depending on the food though. Silver-Ions still are used in water conservation.
Think also of those pure silver plates and forks and knives. The toxicitiy of Silver for man is regarded as very low.
More likely Aluminium is used on those plates. Lately that metal is dicsussed on the behalf of its long term toxicity. Though again the amount of Aluminium to be taken up from those dishes would be practically lesser than from other sources, as Aluminium pots.
Furhermore there is a good Chance that you won't even get in contact with that Aluminium as it may be located on the underside of a plastic foil.