RFID tags with a unique code. Localising items using reader and this unique code.

I am looking for a way of marking small boxes (say shoe-boxes) with tags that can be read from a distance (5+ metres). The tags must each have a unique code that does not need to be ever changed. No data is stored on the tag - it is all on a database stored elsewhere and keyed on this unique code.

Ideally, the requisite tag would beep or light up when the user enters its unique code - so that the appropriate box can be quickly found.

I hope I have made myself clear, but feel free to ask for more details if not. I have looked everywhere and have not found what I am looking for.
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AlfredMelbourneAuthor Commented:
Thank you John. Most helpful.

I only put up this a short while ago and most people in the USA are still asleep (I am in Melbourne) so I will wait to see if anyone has better suggestions.
AlfredMelbourneAuthor Commented:
I wrote to the company mentioned and they won't reply - not the fault of responder.
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