Where can I find scans of D&D:TFBG board game cards?
I don't know where you can find scans to download and print, but you can use BGG to help out with things:


Full component list (with card names, but not full card text)
2013 Spare Parts Resource List entry for the game - He could post his wants there after seeing what is missing
Image gallery for the game (15 pages of images, there might be images of the cards)


Not a lot of scanning of cards for printing purposes because that leads to copyright issues, and since we're talking about WotC, they WILL go after people with C&amp;D orders if and when they find that sort of thing. But the above links should help him in getting the actual cards.