Your phone was stolen. What about the photos in it?

You reach for your pocket and it is empty. The first thought is the phone. The second, a few seconds later, is everything on it.

What you can do, with or without ZeroBox

From another device, open Google’s Find Hub (earlier called Find My Device). You can see the phone, lock it or erase it. Locking and erasing need the phone to be on and connected. On some newer phones, such as the Pixel 8 and later, it can still be located for several hours after it is switched off.
Ask your carrier to block the SIM card.
Change the passwords of your accounts, starting with email and messaging.
If you report the theft, the police will ask for the phone’s serial number or IMEI. Look for it on the box or the receipt.

The vault files are encrypted with AES-256, and the key is tied to your phone and your PIN, not to a server. Each PIN attempt also goes through the phone’s secure chip (Double Guard), which asks for the fingerprint or the screen lock, so the PIN cannot be tried against a copy of the files.
A longer PIN is harder to guess than a short one.
A transfer file saved earlier is your way back. On a new phone it becomes the vault again, opened with the PIN or the recovery key you chose.

If the phone is taken while the vault is open, the vault stays open until the lock closes it.
ZeroBox has no account and no internet permission, so it can neither show where the phone is nor erase it remotely. Find Hub does that for the whole phone.
Anything outside the vault, such as the gallery or chat apps, is as exposed as before.
Without a transfer file, a stolen phone is a lost vault for you too.