If it helps, you can point out to them all the sellers on Etsy MAKING MONEY from their IP. Tell them to pursue those who're directly taking money from association to their brand instead of those trying to make a well-design, non-profit product that'll only increase awareness and interest in their franchise. Seriously, these companies can sometimes be so
absolutely clueless as to what to allow and what not to, what's best for them and what's not.
Besides, isn't SP currently producing the DSA ones?
Also, I believe their trademarks for Nuka Cola don't include keycaps... Here is the list from the most applicable trademark (filed 5 August this year, found here:
http://tmsearch.uspto.gov/):
"metal key chains, headphones; video game accessories, watches and jewelry; collectible bottle caps; collectible statues, posters; artwork; notebooks; calendars; wall decals and stickers; books; comic books, wallets; messenger bags; backpacks; leather key chains; leather portfolios; purses; belts; lunch boxes; cups and mugs; glassware; shot glasses, shower curtains; towels, clothing, namely, shirts, sweatshirts, sweaters, fleece pullovers, jackets and leggings; headwear, namely, hats; footwear, namely, sneakers; socks, bobble-head dolls; plush toys; action figure toys; snowboards; board games; card games; replica weapons; puzzles"
Unless they categorise keycaps as "video game accessories". Which they aren't.