Add text to InDesign with script?

We have about 500 1 page InDesign files which each need a bit of text added to them in the format:

Completion Year xxxx

The text needs to be right justified and placed below other text boxes which hold information such as client and location, in the same font/format.

Ideally, a script which would add a text box with the appropriate date (perhaps taken from an excel or csv file?) would be great.

Failing that, a script that inserts the text box and "Completion Year" in the correct location on the page and font would also be very helpful.

Any help/insight is appreciated.