How do I reclaim space from sparse bundle?

Hi all,

Using EL CAP 10.11.5

I made a my.sparsebundle that was for 2GB

- then I almost filled it up

- then I deleted 50%

- then ran the terminal command

- it Reclaimed 0 bytes

- so I deleted everything inside and reran the command

- still it Reclaimed 0 bytes

Q How do I get this working?

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how do I reclaim space from sparse bundle?

I went to terminal and typed:

hdiutil compact /Users/me/Documents/my.sparsebundle

and it succeeded but said = Reclaimed 0 bytes out of 48.9 MB possible.