I just looked too
I don't believe they do that

serial number/date code or POP receipt is just what they go by for warranty service
This off the warranty page
Note:
•Date code of tool will be used to determine if product is within warranty period
• Copy of invoice or bill of sale will be required for warranty verification if date code is over warranty period
•Warranty Registration is not necessary to obtain the applicable warranty on a Milwaukee Tool® product
Now though for your OWN purposes you can create an account, your "Dashboard" as they call it and keep an inventory log online of all your tools purchase dates, serial# etc. It's all part of the One Key App tracking system. but you can just use it even without the One Key App tracking features or owning One Key tools
Create an account and then hit the one key launch button
Best we got