After all of their hard work breaking into the boxes, it can be anticlimactic for students if there isn't some kind of a reward inside the box. Here are some ideas of prizes that you could hide inside the box.
Many students have never used a lock or are unfamiliar with the various locks in the kit. When introducing the activity, it is helpful to show each lock under the doc cam and explain where they should line up the characters on the lock once they have a guess as to the combination, and that they need to pull apart to open.
You may need to scan a QR Code for some activities. I recommend this QR Code Reader since it's easy to use. Just share the link in Google Classroom with your students. Students click on Scan, and will need to Allow the camera. For very young students, you might set up some Chromebooks with the QR Code Reader website already open for them.
If students have access to iPads or smartphones, they can use the camera on their device to scan a QR code as well.
Provide scratch paper or a whiteboard and dry erase markers for students. They may need them to figure out the clues. Also some activities may require that the students use the dry erase markers on the laminated materials.
When setting up your activity, check that the flashlights work. It's best to do this the day before your activity in case you need more batteries. Your school site will need to order more batteries when needed.
Setting up a Breakout activity can take a lot of time. Here are some time estimates to help with your planning.
You may want to label the boxes, the key lock, and the keys associating with each lock so that you can keep track of which key goes to which key lock. For example, label a box as Box 1, and then use a sharpie or label-maker to put a 1 on a key lock and it's associated keys.
Make sure to replace any labels that come off or rewrite the numbers when they fade.
If you like an activity, you may want to save the online materials, as well as your notes about the activity, in Google Drive.
If you take good notes, you won't have to read through the activity or watch the video again on the Breakout platform next time you use the activity.
It might be good to have a Shared folder or Shared Drive where teachers can collaborate.