Does the Zip have bluetooth sync to an iphone? If so, when I lost my Fitbit One, the Fitbit folks told me to walk where I lost it with an iPhone and see if the bluetooth picks it up to narrow down the search area. Also, I had emailed for help connecting an old Fitbit Ultra to my new computer (turns out it was dead) and told them it was because I had lost my Fitbit One. After giving me the steps for trying to fix my Ultra or find my One (neither of which worked), they offered to sell me a new One at a reduced price. Might be worth a try if you don’t find it. Good luck.