[SS10] Abnormally large file?

I received a file from a client with the sheet border they wish us to use on our project.

One model, One border consisting of 96 elements:
2 Cells
24 Lines
5 Line Strings
3 Raster Attachments (not large, used on other projects without issue)
11 Shapes
2 Shared Cells (same definition)
41 Text
5 Text Nodes
1 Cell

There does not appear to be Design History on this file. All levels are turned on (view and globally) and "thawed". "Fit All" does not show any elements beyond the visible elements.

Yet this file is over 14Mb in size. I have tried compressing it, and there is no change.

What on earth could make an (apparently) simple file so massive? I'd attach it so you folks could look at it, but 14 Mb is too large to attach...
I will be filing a Service ticket about this, but I thought I would pick your magnificent minds for ideas I might have overlooked.