Not without buying a USB drive of 2TB..
The TC is a network drive.. disk drill is useless.. it cannot recover anything from a network drive..
Sadly it is far from uncommon for the sparsebundle to be empty.. Time Machine is a self defeating self eliminating software that regularly deletes its own backups.. however the sparsebundle which is a virtual disk does not shrink.. it simply gets emptied.. you might appear to have big backups.. the reality is TM probably smashed itself.
Anyway the only way to find out is to connect the disk to the computer directly.. this means either pulling the disk out of the time capsule.. not recommended for latest model.. they are made with fragile plugs and ribbon wires. Or make an archive.. ie an identical copy of the files to USB and plug that into your computer.. and you can then play around with all and any utility you like.. but they won't repair a sparsebundle.. you MUST use the verify from TM as I mentioned above.
You can use TM command line tools.. Athough I doubt that gives you much benefit.. you can also mount the sparsebundle in Finder and actually check what is available under each date.. this is long and laborious process but if your itunes library is there.. that is how to find it once TM has given up.
Please note.. the reason to use USB is to not damage the original file if anything is left.. of course you should have Time Machine off in your computers.. further backups will just destroy anything left behind.
BTW .. since Sierra Time Machine is totally unreliable when using Network drives.. you must either use a USB drive plugged directly into the computer or you can change over to a decent backup software like Carbon Copy Cloner.
