Hi there, @drcoder.
QuickBooks Desktop for Mac will eliminate the leading zeroes on the transaction numbers when exporting reports to Excel. These figures will show up if you export the report from QuickBooks Desktop for Windows.
To include the zeroes on the spreadsheet, you'll need to enter them manually.
I can see the importance of this ability in your business. This is why our developers are aiming to improve the product and to provide you the best customer experience.
I encourage you to visit the What's New section on your QuickBooks to stay current with our news and updates. Just click on the Help menu then select What's new with QuickBooks.
Reach back out to me here if you have any other concerns. I'm always ready to lend a hand. Have good one!