QR code scanned contacts - how do I instantly find them?

Sparkle ~ I created a custom shortcut for you to scan your Contacts for ones that were created between specified dates. Here's the iCloud link:

Contacts Created Between Dates

...Tapping that link should show a blue Get Shortcut button at the bottom – the shortcut will be added to your shortcuts collection. Then just tap the shortcut to run it:

The shortcut will ask you how many contacts to scan (newest to oldest) in case you have hundreds of contracts. Then it will ask for the beginning and end date to scan. If you have any difficulty, post back.

Shortcuts User Guide for iPhone and iPad

Shortcuts User Guide for Mac

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When you look deeply you will find that Contacts are neither stored on an iPhone nor on SIM. They are synced to an email account that you may have added and enabled Contacts. It could be Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other email client server account.

When you enable Contacts in any of the email accounts they are displayed to you through the Contacts App. When you edit these contacts on an iPhone they are ultimately edited on the client-server.

There are multiple business card readers in the App Store which are compatible with the Contacts App and can do what you are looking for.