Maintenance for the week of May 20:
• PC/Mac: NA and EU megaservers for patch maintenance – May 20, 4:00AM EDT (8:00 UTC) – 10:00AM EDT (14:00 UTC)
• Xbox One: NA and EU megaservers for maintenance – May 22, 6:00AM EDT (10:00 UTC) – 9:00AM EDT (13:00 UTC)
• PlayStation®4: NA and EU megaservers for maintenance – May 22, 6:00AM EDT (10:00 UTC) – 9:00AM EDT (13:00 UTC)
Those used to open the treasure vaults in IC? You farm them in there.
Those gained from completing the public group delves? Well, by completing the public group delves. I think some can be sold to a vendor for 0 gold, some you need to destroy. Since there is zero benefit aside from the funny effect they make on use, it doesn't matter except in loss of entertainment.
Those collected from mobs that count toward the achievements? Before the last update, you had to use them, removing the item from inventory, to have it count for the achievement. Now you retain them, but the item itself is useless. Also, chances are that you will not be able to complete these achievements anyways, since ZOS in its boundless wisdom decided that we are not allowed to transfer them between chars on the same account and some will not drop for you because you outleveled the only farm spots.
Any other trophies? Well, post and maybe I can find something to say about those as well.