Help! Does anyone know where to get old US Mint item numbers?

I have a several modern sealed US Mint items but don't know remember what they are. Is there anyplace where I can cross reference the item number to what they really are? The Mint website was of no help nor a Google search.
Here is what I am trying to identify by the item number on the bar code:
U05
R48
2X5
4U8
Any help is greatly appreciated.
Thanks
Here is what I am trying to identify by the item number on the bar code:
U05
R48
2X5
4U8
Any help is greatly appreciated.
Thanks
“In matters of style, swim with the current; in matters of principle, stand like a rock." - Thomas Jefferson
My digital cameo album 1950-64 Cameos - take a look!
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“In matters of style, swim with the current; in matters of principle, stand like a rock." - Thomas Jefferson
My digital cameo album 1950-64 Cameos - take a look!