flip out that inscription with 15^50 one and you might have somfin worth selling other than that take hifis advice salvage i'd salvage vampiric and hope for them to still be there, i think vampiric dagger mods worth somthing
Yeah, hold on to them. In the future you may see a few assassins willing to buy daggers... since the req, skin and incribable feature is ncie you may earn some cash for your find, so just hold on to them for now.
id say either upgrade them if ur gonna use them (to your taste) or sell on (price depends on how u re-mod it), OR stick a "Hilghly Salvageable" inscription and get a couple rubies.