Cross-referencing bug reports for relevant information:
Person who cannot salvage Exotic Items. Keep in mind, all these trophies are Exotic items.
Aurora Collection trophies cannot be salvaged.
Salvaging Trophy's for Unbound Magic not working
Just before the EoD expansion, I was working on this, and it worked up until then. A few days after release, went back to these quests, and trophies cannot be salvaged now.
1. Items still have description: Salvage for unbound magic.
2. Can use Salvage-O-Matic on them. Gives pop-up reminder: This is a very valuable piece of equipment. Are you sure you want to salvage [name_of_item]?
3. Accept does nothing, and the mouse icon is still the Salvage-O-Matic and can click on other salvage items.
4. I do not wish to salvage my Exotic gear atm, so cannot test if other Exotic items are salvagable. Since all of these trophies are Exotic, I would hypothesize that the first link above is correct, they aren't salvageable because no Exotic gear is.