Hi Anne, it's good to know I'm not the only one to have noticed the Ebay listings tray powder pot and sometimes pin dish are often seen together with the 2501 candlesticks.
I have seen the tray and pot as a mish mash with other random pieces a couple of times, but I believe this particular combination has now cropped up too many times to be coincidence.
Regarding the pin dish, it's hard to see in the listing, but I believe it's an oval shape (the measurements suggest such) and has the same pattern base as my example peach/pink pot shown above, I have seen pictures of a it a few times and there is a current listing here showing it slightly more clearly on the left with the powder pot in the middle, and another random pin dish on the right. http://www.ebay.co.uk/itm/BAGLEY-PINK-GLASS-DRESSING-TABLE-TRAY-POT-TWO-TRINKET-DISHES-/110887026598?pt=UK_Art_Glass&hash=item19d161bfa6
Regarding quality, my peach/pink pot certainly seems of Sowerby quality in my experience.
I don't think it's beyond the realms of reason to speculate that Sowerby may well have used the 2501 sticks for another set, they certainly seem quite casual about combinations in the 1933 catalogue advert for the Junior set, "also Cadet, brush tray with star centre"
So yes could this be the elusive Maid set? Time will tell, but meantime I personally feel it's likely this is a Sowerby made set.