Block Thumbnails and Block Names with Wildcards

First an answer, then a question...

Thumbnail images for blocks are not displayed in AutoCAD® DesignCenter
Published date: 2003-03-06 ID: TS34512
Applies to: AutoCAD® 2002AutoCAD LT® 2002AutoCAD LT® 2000iAutoCAD LT® 2000
Thumbnail images for blocks do not display in AutoCAD DesignCenter for drawings created in previous versions of AutoCAD or AutoCAD LT® software.
Blocks created in older versions of AutoCAD or AutoCAD LT do not store a preview or thumbnail of the block in the drawing. Instead, you must use the BLOCKICON command to save a thumbnail image for blocks.Enter BLOCKICON on the command line. Press ENTER. Enter an asterisk (*) to update all blocks, or enter the name of the block you want to update. Press ENTER. The number of updated blocks is displayed on the command line.

Now, for the question...
Renaming blocks with wildcard characters
I'm doing some drawing cleanup, drawings have been modified with different programs such as ADT, etc. I've done some flattening, translating, exploding, etc. I have design center open, and am using the RENAME command to relabel the blocks to things that make sense.
I noticed that there were some blocks named, eg, *E535. They showed up in the RENAME dialog box, but, not in Design Center. So, I used rename to remove the asterisk, then they showed up in DC preview just fine so I could see what they looked like and rename them accordingly.
BUT! while there were a few of those that have shown up, I was moving around the drawing and saw some objects with block names of eg. *U174, etc but they show up neither in the DC nor the RENAME dialog.
Why is that? And, how can I get at them to rename them easily?
Anyone have an answer/solution/work-around for me?
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