I got robbed :(

was probably an "inside job" had to be someone with access to the old place and knew the stuff was there ;) my guess is that it's kinda doubtful it was a random stranger

i.e. a neighbor or a new owner or someone who knew you were moving said to a buddy "pssst i know where a bunch of parts are sitting bring your truck over"

frikken thiefs in this world

i would approach each of the people in that category, and let them know you dont know who did it and dont have any proof but you hope that what goes around comes around and they enjoy some bad karma returns this year