If it's not listed in the catalogue (which I can confirm) it would be the best if you show a scan of the stamp to see if it's perhaps a similar local type.
If you are seriously collecting precancels, one of the references that is a must have is the Precancel Stamp Society's Town & Type catalogue.
One of the drawbacks to this catalogue is that it will tell you if a precancel type exists for a particular city and state, but not which stamps it was used on. That would be an entire series of catalogs, not just a single book.
I've been collecting them for years and I do not have an Omaha, Nebr. 632-41. That doesn't mean that it doesn't exist, as I do not have anywhere near a complete collection. I'm not sure if anyone does, for that matter as it would require literally millions of stamps.
Hope this helps. Again, if you have a specific stamp in hand and think it is a 632-41, post a scan of it. Either myself, or someone else, will look at it and let you what you have.
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