My best advice is to cancel the veg box and start growing your own.
I used to get a veg box and cancelled it because of exactly the problem you are facing and because I could buy best quality in M&S. I eventually had a go at growing my own. I enjoy it more and it really is not hard.
Now to the veg box de jour.
Savoy cabbage, mushrooms, Slice fine and fry in plenty of butter. Fry pancetta separately and then put into the cabbage/mushroom mix and add a little white wine and plenty of black pepper and nutmeg. Reduce slightly. Boil some pasta and combine the whole lot with a parmesan on top. Serve in large bowls.
Fennel bulb. Shred fine with a little onion or shallot. Fry in butter along with rissoto rice and then make risotto with chicken stock and black pepper in the usual way. Right at the end add a good glass of vodka and plenty of grated parmesan and seve immeditely with parmesan and black pepper on the table.
Tomato. Liquidise, Freeze and use in spag bol with some tomato puree when you next make it.
Keep turnips until xmas in fridge and use in roasted veg with carrot, parsnip and herbs done in olive oil, herbs, black pepper and salt. See Delia recipe for winter roasted veg.
Sprouts. Wash, slice in half, dry thoroughly. Deep fry. Mix with chopped and toasted walnuts as a winter veg.
Beetroot. Bin them. Vilest veg on the planet.