Detecting AVCHD File Corruption

I am concerned about file corruption when copying AVCHD files with Finder (for backup purposes).  My question is this:
Once I've copied large AVCHD files with Finder, how can I verify that they are no corrupt?
Before I erase the files from my camera, I want to be certain that the copying of the files to my computer was successful.  Thus far, my scheme for verifying they are intact has been to begin the process of bringing the files into Final Cut Pro or iMovie (mainly iMovie, actually).  My presumption is that if the files appear and I can see the thumbnail, they must be intact.  Is my presumption correct?  Or could corruption issues manifest themselves later when I try to edit the footage?  I'm storing quite a lot of valuable AVCHD files now with the intent of editing them later.
I would greatly appreciate any input.
(Note:  I know that one very good way to ensure the integrity of AVCHD copies is to use Shotput Pro.  I know this because people in this forum have recommended it.  However, I'm not ready to invest in it yet.)

Hi Shane,
Yes, like I said, I know about Shotput and that it would be a good investment, but it's one I can't make right now.
If I'm scrubbing through the video in the Final Cut Pro Log & Transfer window, and I can scrub all the way through it, doesn't that mean that the video is intact? 

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