How to autolabel existing block attribute?

[jboyceQPURR]

I have a few hundred blocks in a drawing with an attribute that needs to have a unique label. The blocks are already placed and need to remain the same location and height/width. All i need to change is giving them unique labels in the attribute. 

Is there  a way to do this? I found a lisp that will allow me to create the labels, but it also has me place the block and I would have to redo the height/width and location. All i want to change is the attribute.

The attached image shows a bunch of blocks, and the XX attribute I want to be unique for each panel.

Thanks

[pendean]

unique how? Explain. But note, someone (you) will need to write out all these digits etc. at some point.

Or do you just need to number them in some sequence?

[JTBWorld]

Our app JTB BatchAttEdit could be used for this. You can either create the number serie right in the editor or via Excel. 

[3wood]

You can also try ALTEXT.