how to set an unique product ID after syspreping OEM Windows 7 pro? Keeping same product ID causes issues later on?

Recently, I received 30 Desktop PCs and I wanted to automate the setup process since I have to setup them myself alone.  I followed the following steps.

1. install all custom applications and Antivirus software on the sample (out of 30PCs) OEM windows 7 pro machine.
2. Setup a temp profile and copy it to the default profile.
3. run sysprep with generalize option and backup image using Acronis.
4  (will) restore images for all 29 PCs

After I restored images to a couple of Desktop PCs, I realized they all have same Product ID. Windows is activated. I am afraid that I will face any issues once I deliver these PCs to users later on. Please advice.
KimiteruSystem AdministratorAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
The WISEST thing to do is REBUILD your image and REDEPLOY.  It's unwise to use unsupported systems in a production environment.  Build the images correctly with a volume license and you can properly deploy them.
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Seth SimmonsSr. Systems AdministratorCommented:
you should either use disk cloning software or use a volume license with sysprep
sysprep is not supported for OEM versions

Microsoft does not support the use of Sysprep to create a new image of a system that was originally created by using a custom OEM installation image or by using OEM installation media.

Unsupported Sysprep scenarios
https://support.microsoft.com/en-us/kb/828287
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KimiteruSystem AdministratorAuthor Commented:
Understood. I will not use current method (Sysprep  windows OEM) for future setups. Thank you for the link.

Unfortunately, as I mentioned, I put images to some PCs and damages done, what should I do? Maybe answer to this goes back to my original questions:  

1. How to set an unique product ID after syspreping OEM Windows 7 pro?
2. Keeping same product ID causes issues later on?
**We use Dell, but I can not see license sticker anywhere on the PCs.

What would be the easiest steps to fix this?
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KimiteruSystem AdministratorAuthor Commented:
Thank you for the comment. Unfortunately, I don't have an option but to configure them manually now. I wished I could automate this process this time and for future..
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