Steam Boat Find?

[Ripcon]

Found this piece of riveted iron on a steamboat wreck in North Mississippi.
Is it part of a boiler? Some type of cargo box? I figure someone on this site could help me clarify what it is. The riveted piece is thick while the other portion of the plating is thin. I don't know what caused the holes. Maybe just thin iron? Any help would be appreciated.

 

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[Ripcon]

I also posted this under shipwreck forums on this site.

 

[4x4x4]

....WHY DOES STUFF LIKE THIS TURN ME ON ??!!

 

[sutphin]

MYSTERY SOLVED AT 9 .TUNE IN AND FIND OUT ABOUT THIS INTERESTING FIND...