Selecting a specific slice

What I have done so far is :
1. Open a jpg file
2. click slice tool
3. mouse right click on the image
4. choose divide slice
5. divide horizontally into 3, vertically into 4, click OK
What I want to do next is, to select the slice no.6 region, so that
the result should look like :
Concentrating much on the slice lines, and zooming in 800% I could achieve this by rectangular marquee tool. But this method is not effective nor elaborate.
Is there a smart way to select(=rectangular marquee) a specific slice ?
Thank you!

Takemistsu wrote:
Thank you. In fact I expected a more elegant solution, so I waited for some time. The above solution cannot be applied to irregular slices, and the method is somewhat less intuitive...
You would need to use Alpha channels you can select by name to support any shake like I bo for collages. Your limited by Photoshop to 53 Alpha channels. And example of such a collage

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