Open the drawing, look at it, copy-paste the info into Excel.
I know I am being sarcastic, but the info provided called for it.
Now, seriously, if you know the TextBox's name, just open the drawing, search for your textbox and retrieve the name. If you don't know the name, your best chance is to get all the textboxes in a specific area where they should be (e.g. Creation Date is at 80mm to the left of lower right corner) and check the text in it using some RegEx.
If stamp is always the same and all elements you need to export have always the same name, then it is quite easy. You can identify texboxes by name, get their values and export to excel or text file is then a piece of cake .
THE question is: do you have the same name for the texts' boxes? If yes, the number of drawings is IRRELEVANT as the process is the same and CATIA will do the work, not you.