"The aura grows brighter then disappears in a brilliant flash. You seem to glow with power and the knowledge of 1206." -- Me, stealing Telekinesis from my Monk
This feedback assumes that every player knows every spell number.
It should more correctly return--at a minimum--what is shown on scrolls: "(###) Spell Name".
For preference, it would also return the mnemonic to be used. "(518) Cone of Lightning [conelight]"
So that the person stealing KNOWS WHAT THE HELL THEY TOOK.
.
(Which I just realized is now more generically "(518) Cone of Elements [coneelem]", but you get the idea.)