yes not every staff appearance can be registered in the equipment storage most of the weapon appearance are “single use”
you need to have 5 copies of that ellinis staff, be mindful tho as you can see it costs 11million silver to do it. you might as well find a premium staff from the market that you like. those doesnt cost silver.
you need to click the mercenary badge from your storage as if you are using an item. they will disappear and will go to your account(mercenary badges are account shared, means all of your other characters can use it). same goes for the lada tokens