There are a few ways to pull a crash report when Boxer crashes.
Syncing with iTunes
This method involves syncing your device with iTunes. After syncing, crash reports will be copied to a specific location on your hard drive. This method is also documented at https://developer.apple.com/library/ios/#qa/qa1747/_index.html.
Sync your device with iTunes on your desktop.
After syncing, look for crash logs in the correct directory. See below for a list of directories for each operating system.
In this directory, look for files starting with "Boxer_".
(NOTE FOR MAC USERS: ~/Library is hidden by default on Mac OS X. To easily get this folder, open the Finder application, then hold the "option" key while clicking on the "Go" menu. You should see a menu item for "Library." Click on that, then continue navigating to Logs, CrashReporter, etc.)
Mac OS X
Windows 7 or Vista
Emailing from a device
Start by opening up the Settings app.
Navigate to General -> About -> Diagnostics & Usage -> Diagnostic & Usage Data.
Select a Boxer crash from the list. This will start with “Boxer_” and contain the timestamp of the crash.
Tap on the crash and you will see a text field with a crash log. Long press to Select All and then Copy the crash text.
Paste it into an email to send to firstname.lastname@example.org.
Using the Xcode Organizer
NOTE: This method will only work for iOS developers. If you are not a developer, you will not have Xcode installed on your machine.
Launch Xcode on your desktop machine.
Open the Xcode Organizer window. (Window menu -> Organizer, or Cmd-Shift-2.)
Find your device in the left sidebar, then select “device logs”.
Choose a Boxer crash (or multiple crashes) and select “Export” at the bottom of the Organizer window. This will copy the crash reports to your hard drive.