The bug testing points to the possibility that this information is contained in the PGF data for the.ai files, which is not parse-able by inkscape. So, this may not be a fixable problem at this time.

https://bugs.launchpad.net/inkscape/+bug/1168782

I have created a bug report here.

Thanks for your reply, Brynn!

I will look into reporting this as a bug.

I did find the resize pages option, and when I create the files in Inkscape, it's easy enough to just use .svg, which keeps the canvas size correct. Thanks for your advice about that.

Best wishes!

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