You can easily extract IDs Mac MBOX files using MacUncle MBOX Email Address Extractor. The tool supports Mac OS Machines.
Start MacUncle MBOX Email Address Extractor on your Mac Computer
Select one option from Add File(s) or Add Folder(s) to upload MBOX file.
Choose requires MBOX email files to extract Email ID
Go to Extract on the Above Menu and select Saving Option. Set up the required field on the filter option for selective extraction
Click the OK button to start Email Address Extraction from the MBOX file.
In a few moments, the tool opens the location with a resultant CSV file consisting of an MBOX email address.