So for example, ignoring any potential timeline issues with canonpoints, items only existing at a certain time, etc, something like a puppet he made and gave to someone else would be fine? What an item or piece of equipment that doesn't belong to him but he frequently would make (mis)use of? Going another step further, would items he presumably possessed in the past but are long gone (e.g. the various kinds of crap a mage would keep in his workshop), or generic things he'd have had regular access to/association with but aren't his specifically (e.g. stuff relating to Camelot/King Arthur) count?

I'm just trying to see how narrow the pool is before I invest much time in brainstorming!