According to the rules, this is what this gift does:
Taking the Forgotten: You can take something from a target who then forgets
about ever having owned it. Make a Mental Challenge; the Garou can retest with
Stealth, the target with Streetwise. Bonded fetishes may stir memories of their own
accord, though (the victim may make a Mental Challenge, Storyteller discretion, to
“remember” that he had an item like this, but not how it went missing or by whom).
It says you can take "something", but it doesn't say that it has to be a tangible "something". I was wondering if it was possible to take a memory or something else non-material. It doesn't exactly say you can't, but I want to be sure of how this works before I ever try something interesting with this gift. Any input would be appreciated. Thanks