This is a very hard question for me.
My entire life I’ve striven to not become attached to material possessions, because… well… if I can’t keep people I care about in my life, why worry about stuff?
The one material thing that holds sentimental value to me are my “Magic Keys”, which were an escape mechanism I used when I was a kid. I still have them, and carry them with me in my purse.
But assuming you want something I lost, misplaced, or gave away at some point… Hm…
I think… I think I would want my tae kwon do trophy – the one I won for being the best damned student in my age bracket. My daddy signed me up for TaeKwon Do after he saw how much I liked the movie “The Karate Kid”, and he (an ex-martial arts student himself) spent hours with me, helping me practice my forms and showing me things the class instructor didn’t have time to do. I remember him being so proud of me when I won that trophy… and that was something I never got to feel again.