How Do I Delete Old Time Machine Backups In Mojave?

When attempting to clean up my Time Capsule, I found a couple of.sparsebundles which are lingering from an old Mac (which I no longer have). When I attempt to purge them, I am getting the error “The operation can’t be completed because the item “bands” is in use.”
I have attempted the following already without success:
1) restarted TC
2) control-option / (File, Delete Immediately)
3) turned of Spotlight (added TC to Privacy section)
4) searched Google for the error – which landed me here to a previous post.. however, the resolution was not documented.
I’m using Mojave 10.14.3
NOTE: I moved the bundle to a new folder on the TC and it worked.. so, it’s not “locked” per se.
Thanks in advance!
—–
Corey D