Attempting to restore from Time Machine backup but its not seeing the latest backup
I recently had to send my MacBook Pro 2017 13" to the Apple Repair center because the USB-C ports stopped working, preventing me from doing things like charging the machine. My most recent backup was to a Time Machine on March 9.
Any time you send your machine in for repair to service center, they wipe the device, no matter whether the issue is related to disk or OS or not. No big deal I thought - I have a recent backup and I also copied critical files to Google Drive. When I received the repaired machine, it was completely wiped so I needed to restore it.
When I go in to restore from Restore mode (Booting in to Cmd-R), I attach to my network and go through the Migration Assistant to attempt the restore. The latest backup it sees is from March, 2017! This cannot be right as I have definitely verified backups more recently than that. I suspect this date is tied to my previous Mac. When I connect to the Time Machine drive from another Mac, I can see that the myMac.backupbundle and myMac.sparsebundle files are there, and have timestamps from March 9.
I'm at my wits end here as to what to do...I am confident that the data is there somewhere but unsure how to proceed with attempting to recover it. I've already spent 2 days on this unnecessary task and am not sure what to do next. Any guidance would be appreciated.
Prior to being wiped, I was running Mojave.
MacBook Pro 13", macOS 10.15