locating duplicate barcodes in a large stack of barcodes

Hi I have a bunch of papers at my work to sort through and each paper has an individual  barcode number printed at the bottom. I have to try to locate any duplicate sheets, so the easiest way I think is to just scan all the barcodes (about 500 pages). I know I can scan them all into excel and then arrange them so they are in order by number, and then just see if I see any numbers with duplicates, but I was wondering if there is an easier way, such as maybe if I can scan them into a program that will alert me (with a pop up window or a red flag) if the same barcode is scanned more then once? does anyone know of such a program?
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Saqib Husain, SyedEngineerCommented:
If your barcodes are in column A then

Select A2:A1000  (or whatever extent you choose)
from the home tab select conditional formatting > New rule
select Use a formula to determine which cells to format
in the box for Format values where this formula is true type
click on the format button
select the Fill tab
select a color like red
click OK
click OK
Just scan your codes into column A. If there is a duplicate it will tell you in column B. See attached spreadsheet.

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EirmanChief Operations ManagerCommented:
The attached sheet counts the number of duplicates in column A if any.

As duplicates are added/removed, previous values will increase/decrease where appropriate.
EirmanChief Operations ManagerCommented:
I am very interested in this subject.

I had a live chat with this company and they definitely confirmed
that a duplicate exclusion option exists during scanning.

hydrive1902Author Commented:
thank you everyone!
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